JP2000164154A - Mask plate of color cathode-ray tube and manufacture of color selection mechanism using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure smooth welding to a frame even if one in which a width of outer portion of aperture which transmits an electron beam is used as a mask plate, and also ensure smooth welding of mask plate to the frame even in the case of color cathode-ray tube where the radius of curvature of mask plate is large, namely, the screen is flat or nearly flat. SOLUTION: A mask plate is provided which has one or plural tensile holes 12 at thin plate portions 11a, 11b of the outside of a part of a stripe-shaped aperture on a long side of a mask plate. The mask plate 11 is welded to a frame 2 by adding a tension to the mask plate 11 by the use of clips 13 under such a condition that a rod-like parts 15 of the clips 13 have penetrated through the tensile hole 12 of the mask plate 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mask plate made of a thin metal plate having a large number of stripe-shaped openings extending in a vertical direction and transmitting an electron beam. The present invention relates to a mask plate of a color cathode ray tube in which a color selection mechanism stretched on a mask is locked, and a method of manufacturing a color selection mechanism using the mask plate.

[0002]

2. Description of the Related Art A trinitron (trade name) type color cathode ray tube is formed as a color selection electrode for selectively transmitting an electron beam by etching a thin metal plate so that an opening (aperture) extends in a stripe shape in a vertical direction. Use a mask plate (aperture grill). The mask plate is welded to the frame in a state where a predetermined tension within a range not more than the breaking strength is applied. The reason why a considerably high tension is applied in this way is to prevent the vibration, impact, and strong sound received by the color cathode ray tube from causing a shaking that causes color shift in a portion between the openings.

As a method of applying a strong predetermined tension to a mask plate, a method of welding a mask plate in a state in which a substantially rectangular frame is pressed and elastically deformed is used.
According to this method, when the above pressure is applied, tension can be applied to the mask plate by the restoring force of the elastically deformed frame.

[0004] In order to make the surface of the mask plate after the welding smooth without wrinkles, that is, to make it possible to weld the mask plate to the frame without any gaps, a device has been devised. That is, when wrinkles are formed on the mask plate, the phosphor stripes are formed in the phosphor screen forming step of the color cathode ray tube,
This is because good formation of the carbon stripe is hindered, and the stripe width is disturbed, which may cause deterioration in image quality.

[0005] One of the ideas is introduced in Japanese Patent Application Laid-Open No. 9-7505. That is, a pair of cylindrical supporting members for supporting the mask plate at both upper and lower edges (parts above and below the opening) are prepared, and the pair of supporting members first use one point (for example, (About the middle point of the long side), and then the contact state is expanded from that point to form a state in which all the upper and lower edges to be welded are in contact with the support member, and welding is performed in this state. That is to do. FIG. 5 is a perspective view illustrating the technique, wherein 1 is a mask plate, 2 is a frame,
Reference numerals 3 and 3 denote a pair of welding sides constituting the frame 2, 4, and 4, respectively.
Are a pair of elastic welding sides 5,5,5 supporting the welding sides 3,3.
Is a pair of mask plate support members.

According to such a method, the distance between two points on the frame and the distance between two points on the mask plate as in the method of contacting from two points before it and expanding the contact area inside the two points. There is no danger that wrinkles will occur due to discrepancies with the above. In that respect it can be said that it is excellent.

[0007]

However, the technique introduced in Japanese Patent Application Laid-Open No. 9-7505 has two problems. First, the width of the upper and lower edges outside the opening (aperture) of the mask plate must be increased. This is because the upper and lower edges are basically parts for welding the frame, but the pair of supporting members must be brought into contact at a position outside the frame during welding, This is because the widths of the upper and lower edges must be increased accordingly, and if the problem of welding is omitted, it naturally wastes the mask plate material.
Since the mask plate is made of a special steel material and is very expensive, the waste of the material naturally causes a reduction in the manufacturing cost required for the color cathode ray tube.

Secondly, the above prior art has a very large radius of curvature with respect to a flat type color cathode ray tube mask plate which has become popular in recent years, and is almost flat, so that its effectiveness is weakened. There has been a problem that it is difficult to completely contact the mask plate. This has the problem that the smoothness of the surface of the mask plate after welding may be poor, so that it cannot be overlooked. That is, the method of first bringing the mask plate and the frame into contact at one point and expanding the contact area therefrom is effective for making good contact when the radius of curvature of the frame is small, but the radius of curvature is effective. Becomes larger, the effectiveness becomes weaker, and the effectiveness becomes almost nil when the color selection electrode becomes almost flat as in the flat type. Therefore, the contact of the mask plate with the frame is incomplete, and the smoothness of the mask plate surface is likely to be impaired. This naturally causes unevenness in the width of the phosphor stripes and black stripes formed using the mask plate as a mask, and deteriorates the screen characteristics, which is a problem that cannot be overlooked.

The present invention has been made to solve such a problem. Even when a mask plate having a small width at the upper and lower outer portions of an opening (aperture) through which an electron beam passes is used for a frame. To enable smooth welding and to enable the mask plate to be smoothly welded to the frame even in a color cathode ray tube having a flat or nearly flat screen, that is, a large radius of curvature of the mask plate. With the goal.

[0010]

According to a first aspect of the present invention, there is provided a mask plate for a color cathode ray tube, wherein one or a plurality of pulling holes are formed in a thin plate portion on a long side outside a portion having a stripe-shaped opening. It is characterized by becoming.

Therefore, according to the mask plate of the color cathode ray tube according to the first aspect of the present invention, it is possible to penetrate the clip-like rod body through each of the pulling holes and to pull the mask plate with the clip fixed. The power can be accurately and sufficiently strengthened. Therefore, the mask plate can be brought into contact with the frame while preventing wrinkles by pulling the mask plate with a stronger force.

Accordingly, the mask plate can be welded to the frame without wrinkles, and it is not necessary that the radius of curvature of the mask plate and the frame be small. Thus, the mask plate can be smoothly welded to the frame even in a color cathode ray tube in which the curvature radius of the mask plate is large, that is, the screen is flat or almost flat.

[0013] In welding, the mask plate does not use a pair of supporting members to contact the frame with the frame, but the mask plate is penetrated through each of the pulling holes with a clip bar.
By fixing the mask plate with the clip and pulling it strongly and with high precision, it can be brought into contact with the frame without wrinkling. Therefore, the width of both upper and lower edges (outer portion of the opening) of the mask plate is indicated by the supporting member. The portion to be formed can be narrowed, and the waste of the mask plate material can be reduced correspondingly.

According to a third aspect of the present invention, there is provided a method of manufacturing a color selection mechanism for a color cathode ray tube, wherein one or a plurality of pulling holes are formed in a thin plate portion as a mask plate outside a portion having a stripe-shaped opening on a long side. The formed one is prepared, and the mask plate is welded to the frame by applying tension to the mask plate using the clip in a state where the bar-shaped portion of the clip is passed through the pulling hole of the mask plate. It is characterized by.

Therefore, according to the method of manufacturing a color selection mechanism for a color cathode ray tube according to the third aspect of the present invention, the bar of the clip is penetrated through each of the pulling holes, and the mask is pulled by the clip with high precision in position. Can be more completely stretched and welded to the frame without wrinkles, which does not require a small radius of curvature of the mask plate and frame. Thus, the mask plate can be smoothly welded to the frame even in a color cathode ray tube in which the curvature radius of the mask plate is large, that is, the screen is flat or almost flat.

[0016] In welding, the mask plate does not use a pair of support members to contact the mask plate with the frame, but the mask plate is penetrated by a clip-like rod into each of the pulling holes.
By pulling the mask plate by the clip with high positional accuracy, the mask plate can be brought into contact with the frame so as to prevent wrinkles. The width can be reduced, and the waste of the mask plate material can be reduced correspondingly.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention basically relates to a method in which one or a plurality of pulling plates are provided on a thin plate portion (upper and lower edges) outside a portion having a striped opening on a long side as a mask plate. A hole having a hole formed therein is used, and tension is applied to the mask plate using the clip in a state where the bar-shaped portion of the clip passes through the pulling hole of the mask plate to weld the mask plate to the frame. The number of the pulling holes may be one at each of the upper and lower edges, but it is preferable to provide a plurality of holes in order to pull the mask plate in a balanced manner. In one example, four pulling holes are provided at each of the upper and lower edges, one at the corner and two at the inside thereof. Another example is to provide one at each of the corners of the upper and lower edges, one at the center thereof, and one at an intermediate portion between the center and the corner, that is, five at the upper and lower sides. It was made. However, these are merely some embodiments of the present invention, and the present invention is not limited thereto.

It is preferable that the shape of the pulling hole of the mask plate is circular, since local concentration of the load during pulling hardly occurs. However, the shape may be triangular or polygonal according to the clip holding mechanism. In welding, when inserting the rod-shaped part of the clip into the opening and pulling the mask plate, for the clip that penetrated the rod-shaped body through the pulling hole at the corner, pull it diagonally in the mask plate, and pull it into the pulling hole inside it. It is preferable that the clip penetrating the rod is pulled in the short side direction of the mask plate.

The reason why only the clips at the four corners should be pulled in the diagonal direction of the mask plate is as follows.
Mask plates are usually welded by seam welding, so that welding proceeds from one end to the other in parallel with the long side, so if only a pulling force is applied in the direction parallel to the short side This is because, when welding is performed in a state where the mask is placed, a local displacement of the mask plate is likely to occur at a welding start point, and if the displacement occurs, this causes a loss of smoothness of the color selection mechanism.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 1 (A), 1 (B), 2 and 3 show one embodiment of the present invention. FIG. 1 (A) shows a mask plate before welding (one embodiment of the mask plate of the present invention). A plan view,
(B) is a plan view showing the arrangement of clips when welding the mask plate to the frame and the pulling direction of each clip;
FIG. 2 is a cross-sectional view of the clip, and FIG. 3 is a perspective view showing a state where the mask plate is pulled toward welding.

In the drawing, reference numeral 11 denotes a mask plate (aperture grill) having an opening (aperture) formed so as to extend in a vertical direction and selectively passing an electron beam. 11a is an upper edge of the region, 11b is a lower edge of the region, and pull holes 12, 12,... Are formed on both upper and lower edges 11a, 11b, respectively. In this example, one pull hole 12 is provided at each corner, and four pull holes 12 are provided between the corners. The width of the upper and lower edges 11a and 11b of the mask plate 11 is smaller than the width of the upper and lower edges of the mask plate 1 used in the conventional manufacturing method shown in FIG. That is, in this embodiment, since the mask plate is brought into contact with the frame without using the pair of support members used in the conventional manufacturing method, the margin 11a of the mask plate 11 is divided by the margin for supporting by the support members. , 11b can be narrowed, thereby reducing the amount of wasted use of the mask plate forming material.

.. Are the edges 1 of the mask plate 11.
The clips 13 are used to pull the edges 11a and 11b of the mask plate 11 as shown in FIG.
Alternatively, it has a groove 14 into which 11b enters. Each of the clips 13 further enters a rod-like portion 15 protruding from one inner surface of the groove 14 and reaching the other inner surface, or is recessed back into the one inner surface. It has an engagement mechanism that changes the state.

When welding the mask plate 11 to the frame 2 (see FIG. 3), the clips 13 are arranged in the respective pulling holes 12 of the mask plate 11 and the bar-shaped portions 15 of the clips 13 are inserted into the pulling holes 12 of the mask plate 11. The mask plate 11 is pulled by a predetermined force by the clips 13, 13,... As shown in FIG. Note that the clip 13 penetrating the rod-shaped body through the pulling hole 12 at the corner is pulled in the diagonal direction of the mask plate, and the clip penetrating the rod-shaped body through the pulling hole inside it is drawn in the short side direction of the mask plate. I try to pull it, but if this is
When welding is performed with only a pulling force applied in the direction parallel to the short side, local displacement of the mask plate tends to occur at the welding start point, and if this occurs, this may impair the smoothness of the color selection mechanism. Because it becomes.

Since the rods 15 are pulled through the respective pulling holes 12 of the mask plate 11 with the clips 13, 13,..., The mask plate 11 can be pulled extremely strongly. That is, since the rod-like portion 15 is in a state of being penetrated through the pulling hole 12, a strong pulling force can be applied to the extent that the pulling hole 12 does not deform or break, and the pulling hole 12 allows clipping. This is because the precision of the positioning is very high since the mask plate 11 is held by the mask 13.

Then, the mask plate 11 is pulled by the strong pulling force described above, and the mask plate 11 is welded to the frame 2 in this state. At the time of this welding, a force F shown by an arrow is applied to the frame 2, and this force F is continuously applied until the welding is completed. When welding is completed, this force F is removed.
Then, a force for expanding the space between the mask welding sides 3 and 3 acts on the mask plate 11 by the elastic restoring force of the elastic supporting sides 4 and 4 of the frame 2, and the mask plate 11 is pulled by a strong force in the vertical direction. State can be made.

According to the present embodiment, the rod-shaped body 15 of the clip 13 is passed through each of the pulling holes 12 of the mask plate 11, and the mask plate 11 is strongly pulled by the clip 13 to more completely extend the mask plate. Since it can be fixed with high precision, it is possible to weld to the frame 2 without wrinkles, and it is not necessary that the radius of curvature of the mask plate 11 and the frame 2 be small. Thus, even in a color cathode ray tube in which the radius of curvature of the mask plate 11 is large, that is, the screen is flat or almost flat, the mask plate can be smoothly welded to the frame.

When welding the mask plate 11 to the frame 2 without using a pair of supporting members,
A mask 13 is inserted into each of the pulling holes 12 by a clip 13.
Of the mask plate 1 with the clip 13
Frame 2 to prevent wrinkles by pulling 1
The width of the upper and lower edges (outer portions of the openings) 11a and 11b of the mask plate 11 can be reduced by the portion supported by the supporting member, and the waste of the mask plate material is reduced accordingly. can do.

FIGS. 4A and 4B show another example of the arrangement of the pulling holes of the mask plate of the present invention. FIG. 4A is a plan view of the mask plate, and FIG. It is a top view which shows the pulling direction by the clip with respect to a mask board.
This is because each of the upper and lower edges 11a and 11b has a pulling hole 12 at each corner, the center, and between the center and each corner.
Is used as the mask plate 11, and each clip 1
3 is pulled as shown in FIG. 4 (B).

[0029]

According to the mask plate of the color cathode ray tube of the first aspect, the rod-like body of the clip penetrates each pulling hole,
Since the mask plate can be pulled by the clip, the pulling force can be sufficiently increased. Further, the mask plate is fixed to the clip by the pulling holes.
Therefore, it becomes possible to make the wrinkle not be caused by pulling the mask plate to make contact with the frame.

Therefore, the mask plate can be welded to the frame without any wrinkles, and it is not necessary for the mask plate and the frame to have a small radius of curvature. Thus, the mask plate can be smoothly welded to the frame even in a color cathode ray tube in which the curvature radius of the mask plate is large, that is, the screen is flat or almost flat.

In welding, the mask plate does not use a pair of supporting members to contact the frame, but the mask plate is penetrated through each of the pulling holes with a clip bar.
The upper and lower edges of the mask plate (outer portion of the opening) because the clip can be firmly and accurately pulled by the clip to contact the frame without wrinkling.
Can be narrowed by the portion indicated by the supporting member, and the waste of the mask plate material can be reduced accordingly.

According to the color selecting mechanism of the color cathode ray tube of the second aspect, since the shape of the pulling hole of the mask plate is circular,
The load concentration when the clip is pulled through the mask plate with the rod-shaped body of the clip penetrating therethrough can be reduced as compared with the case where the pulling holes are triangular or polygonal.

According to the method of manufacturing a color selection mechanism for a color cathode ray tube according to the third aspect of the present invention, the rod-shaped body of the clip is passed through each pulling hole, and the mask plate is pulled completely accurately by the clip to make the mask plate more complete. The mask plate and the frame do not need to have a small radius of curvature. Thus, the mask plate can be smoothly welded to the frame even in a color cathode ray tube in which the curvature radius of the mask plate is large, that is, the screen is flat or almost flat.

When welding, the mask plate does not use a pair of supporting members to contact the frame, but the mask plate is penetrated through the bar-shaped body of the clip into each of the pulling holes.
Since the mask plate can be brought into contact with the frame so as not to wrinkle by strongly pulling the mask plate, the width of the upper and lower edges (outer portions of the opening) of the mask plate is reduced by the portion supported by the supporting member. Therefore, the waste of the mask plate material can be reduced correspondingly.

According to the method of manufacturing a color selection mechanism for a color cathode ray tube according to the fourth aspect, since the corners of the mask plate are pulled in the diagonal direction of the mask plate, only the pulling force in the direction parallel to the short side is applied. Unlike when welding in the added state,
It is possible to eliminate the possibility that local displacement of the mask plate occurs at the welding start point.

[Brief description of the drawings]

FIGS. 1A and 1B are views for explaining one embodiment of the present invention, in which FIG. 1A is a plan view of a mask plate used,
(B) is a top view which shows the arrangement | positioning of the clip at the time of welding to a flame | frame of a mask board, and the pulling direction of each clip.

FIG. 2 is a sectional view of a clip used in the embodiment.

FIG. 3 is a perspective view showing a state in which a clip is pulled on a mask plate toward welding in the above embodiment.

FIGS. 4A and 4B show another example of the arrangement of the pulling holes of the mask plate, wherein FIG. 4A is a plan view of the mask plate used, and FIG. It is a top view which shows the arrangement | positioning of the clip at the time of welding, and the pulling direction of each clip.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

2 ... frame, 3 ... mask welding side, 4 ... elastic supporting side, 11 ... mask plate, 11a, 11b ...
Both upper and lower edges of the mask plate, 12 ... holes for pulling, 13.
..Clip, 15 ... Bar-shaped body.

Claims (4)

[Claims] 1. A color cathode ray tube which is made of a thin metal plate having a large number of stripe-shaped openings extending in the vertical direction and arranged in parallel to each other, and which is stretched on a substantially square frame under a predetermined tension. In a mask plate constituting a color selection mechanism to be locked, one or a plurality of pulling holes are formed in a thin plate portion on a long side, outside a portion having a stripe-shaped opening. Color cathode ray tube mask plate. 2. A mask plate for a color cathode ray tube according to claim 1, wherein the pulling holes are substantially circular. 3. A color selector in which a mask plate made of a thin metal plate having a large number of vertically extending stripe-shaped openings through which electron beams are transmitted is stretched on a substantially square frame under a predetermined tension. In a method of manufacturing a color selection mechanism for a color cathode ray tube having a mechanism locked, one or a plurality of pulling holes are formed in each thin plate portion on a long side outside a portion having a stripe-shaped opening as a mask plate. Preparing the above, welding the mask plate to the frame by applying tension to the mask plate using the clip in a state where the bar-shaped portion of the clip penetrates the pulling hole of the mask plate. A method for manufacturing a color selection mechanism for a color cathode ray tube, characterized by comprising: 4. The direction of the tension applied to the mask plate when welding the mask plate to the frame is determined by the direction of the mask plate.
4. The method according to claim 3, wherein the corners are in a diagonal direction of the mask plate, and the insides are in a short side direction of the mask plate.