JP2002237254A - Extension type shadow mask and material for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a material for an extension type shadow mask, capable of minimizing the dimensional fluctuation of the shadow mask, and the extension type shadow mask. SOLUTION: As for the material for the extension type shadow mask formed by being rolled to a prescribed thickness, the height of elongation at its end is kept at 3 mm or less, its camber is kept at 3 mm/2 m or less, and the rate of dimensional change before and after heat treatment is kept at 0.015% or less in its parallel rolling direction and its vertical rolling direction. At this time, the material for the shadow mask is heat-treated in advance under a prescribed condition wherein no recrystallization is caused. The extension type shadow mask having a quantity of dimensional fluctuation of not more than 55 μm before and after the heat treatment is manufactured from this material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for an extended shadow mask and an extended shadow mask, and more particularly, to an extended shadow mask capable of improving the dimensional accuracy of an extended shadow mask and minimizing dimensional fluctuation. The present invention relates to a shadow mask material and an extended shadow mask.

[0002]

2. Description of the Related Art A general shadow mask is roughly classified into a press-type shadow mask which is pressed and mounted in a cathode ray tube, and a stretch-type shadow mask which is expanded and mounted in a cathode ray tube. Among these, the expansion type shadow mask includes a slit type shadow mask (referred to as an aperture grill) and a slot type shadow mask.

In a cathode ray tube using such an extended shadow mask, a method for exposing and forming a fluorescent screen in the cathode ray tube involves the following steps. (1) A shadow mask is mounted on a glass panel, and the shadow mask itself exposes and forms the fluorescent screen. And (2) a method of exposing and forming a phosphor screen on a glass panel in advance using artwork without using a shadow mask. In the former method, since the fluorescent screen is exposed and formed by the mounted shadow mask, it is possible to irradiate the electron beam after the phosphor is coated on the fluorescent screen and land the electron beam on the fluorescent screen. There is no landing error that the electron beam cannot be landed at a desired position.

[0004]

However, in the latter method, an artwork for exposing and forming a phosphor screen and a mask for landing an electron beam on the phosphor screen after the phosphor is coated on the phosphor screen. Since (shadow mask) is different from the (shadow mask), there is a problem that a landing error occurs when a shadow mask with poor dimensional accuracy is used or a shadow mask whose dimensional variation is caused by heat treatment is used.

The inventors of the present invention have conducted various studies on these problems, and as a result, have found that the flatness of a rolled coil having a predetermined thickness, which is a material for a stretch type shadow mask, affects the dimensional accuracy of the shadow mask. Was.

However, even if a stretchable shadow mask having excellent dimensional accuracy is manufactured, the stretchable shadow mask is stretched after being heat-treated and mounted in a cathode ray tube. However, there has been a problem that dimensional fluctuations occur in the stretchable shadow mask.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to improve the dimensional accuracy of an extended shadow mask and to minimize dimensional fluctuations. A mask is provided.

[0008]

According to a first aspect of the present invention, there is provided a stretchable shadow mask material rolled to a predetermined thickness, wherein the stretchable shadow mask material comprises:
Edge extension height is 3mm or less and camber is 3mm or less / 2
m, and the dimensional change before and after the heat treatment is not more than 0.015% in the rolling parallel direction and the rolling vertical direction.

According to the present invention, the material for an extended shadow mask rolled to a predetermined thickness has an edge elongation height of 3 mm.
mm or less and the camber is 3 mm or less / 2 m,
It shows good flatness. In such a stretch-type shadow mask material, in the shadow mask exposure process, the tension applied to the material tends to be uniform at each part of the shadow mask material, and the amount of extension of each material part based on the tension tends to be uniform. As a result, the stretched shadow mask manufactured from the stretchable shadow mask material of the present invention is of high quality with excellent dimensional accuracy. Further, since the dimensional change rate before and after the heat treatment is 0.015% or less in the rolling parallel direction and the rolling vertical direction, the stretchable shadow mask material is manufactured by using the stretchable shadow mask material. The mask shows only a small dimensional change of less than 0.015% in the direction parallel to the rolling direction and the direction perpendicular to the rolling direction after the heat treatment at the specified temperature. As a result, the stretchable shadow mask that has been stretched and mounted in the cathode ray tube is of high quality with a small dimensional variation with respect to a predetermined discrimination hole interval.

[0010] According to a second aspect of the present invention, in the stretchable shadow mask material according to the first aspect, the stretchable shadow mask material is heat-treated in advance under predetermined conditions that do not cause recrystallization. It has a special feature.

According to the present invention, since the material for the extended shadow mask is heat-treated in advance under predetermined conditions that do not cause recrystallization, the extended shadow mask manufactured from the material is subjected to heat treatment at a specified temperature. Even when the heat treatment is performed, the dimensional change before and after the heat treatment becomes 0.015% or less in the above-described rolling parallel direction and rolling vertical direction. The small dimensional change before and after the heat treatment, which is achieved based on the heat treatment performed in advance, will improve the dimensional accuracy of the manufactured stretch-type shadow mask.

According to a third aspect of the present invention, there is provided an extended shadow mask manufactured from an extended shadow mask material rolled to a predetermined thickness, wherein the extended shadow mask material has an edge extension height. Is 3 mm or less, the camber is 3 mm or less / 2 m, and the dimensional change before and after the heat treatment is 0.015% or less in the rolling parallel direction and the rolling vertical direction.

According to the present invention, the material for the stretch type shadow mask rolled to a predetermined thickness has an edge elongation height of 3 mm.
mm or less and the camber is 3 mm or less per 2 m, indicating good flatness. If such a material for a stretchable shadow mask is used, in the shadow mask exposure process, the tension applied to the material tends to be uniform at each part of the material for the shadow mask, and the amount of extension at each part of the material based on the tension is uniform. Easy to be. As a result, the stretchable shadow mask of the present invention is of high quality with excellent dimensional accuracy after being stretched and mounted in a cathode ray tube. Even if the stretched shadow mask of the present invention is heat-treated at a prescribed temperature, the dimensional change before and after the heat treatment is 0.015% or less in the rolling parallel direction and the rolling perpendicular direction, so that the predetermined discrimination hole interval is not increased. On the other hand, it is of high quality with small dimensional variation.

According to a fourth aspect of the present invention, in the stretchable shadow mask according to the third aspect, a dimensional variation of the stretchable shadow mask before and after the heat treatment is 55 μm or less.

According to the present invention, since the dimensional change before and after the heat treatment of the extended shadow mask is 55 μm or less, such an extended shadow mask can accurately land an electron beam at a predetermined position.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stretchable shadow mask material and a stretchable shadow mask according to the present invention will be described with reference to the drawings.

The material for an extended shadow mask of the present invention (hereinafter referred to as "material for shadow mask") is a raw material for producing an extended shadow mask (hereinafter referred to as "shadow mask"). Generally, as shown in FIG. 1, a coil-shaped shadow mask material 1 that has been rolled to a predetermined thickness is preferably used. A cut rolled plate material may be used.

According to the present invention, the shadow mask material 1 comprises:
(1) It has an end elongation height T of 3 mm or less, (2) has a camber K of 3 mm or less (3 mm or less / 2 m) per 2 m, and (3) heat-treats the shadow mask material 1 The dimensional change before and after the rolling is 0.015% or less in the rolling parallel direction and the rolling vertical direction.

As shown in the enlarged end view of FIG. 2, the end elongation height T represents the wave height of the end surface Z of the shadow mask material 1 in the rolling vertical direction. This end extension height T is
As shown in FIG. 3, the shadow mask material 1 is placed on the surface plate 2, and the gap between the end surface Z and the surface plate 2 is represented by a value measured by the gap gauge 3.

The end extension height T is 3 mm or less, more preferably 2 mm or less. In the shadow mask material 1 having such an edge elongation height T, the tension applied to the material 1 tends to be uniform at each portion of the material 1 and the extension amount of each portion of the material 1 based on the tension tends to be uniform. Therefore,
The amount of extension at each part of the shadow mask material 1 becomes uniform also by the tension applied in the exposure step when manufacturing the shadow mask. As a result, the shadow mask manufactured from the shadow mask material 1 is of high quality with excellent hole dimension accuracy. When the end elongation height T is 2 mm or less, the flatness is excellent, and the amount of extension of each part of the material 1 based on the tension applied to the material 1 becomes more uniform. As a result, the shadow mask manufactured from such a shadow mask material 1 is of high quality with more excellent hole dimension accuracy.

On the other hand, when the end extension height T exceeds 3 mm,
In some cases, it is difficult for the tension applied to the material to be uniform at each part of the shadow mask material 1.
In some cases, the extension amount of each part is difficult to be uniform. for that reason,
Even if the above conditions (2) and (3) are satisfied, the amount of extension in each part of the shadow mask material may be uneven due to the tension applied in the exposure step. As a result, the shadow mask manufactured from the shadow mask material may be inferior in the accuracy of the hole size, and may be deteriorated in quality.

As shown in FIG. 4, the camber K indicates the degree of curvature of the shadow mask material 1 in the rolling parallel direction. In this camber K, a shadow mask material 1 cut out to a length of 2 m along a rolling parallel direction is placed on a surface plate 2 and a straight line connecting one long side corner along the rolling parallel direction of the material 1. It is represented by a value obtained by measuring the maximum gap between P and the material 1.

The camber K is 3 mm or less / 2 m, more preferably 2 mm or less / 2 m. In addition, even when the cut length is not 2 m, what is within the range of the above ratio is within the scope of the present invention. For example,
Even if 1.5 mm or less / 1 m, 4.5 mm or less / 3
m. In the shadow mask material 1 made of the camber K, the tension applied to both sides of the material 1 tends to be uniform, and the amount of extension of each side of the material 1 based on the tension tends to be uniform. Therefore, the amount of extension on each side and each portion of the shadow mask material 1 becomes uniform also by the tension applied in the exposure step in manufacturing the shadow mask.
As a result, the shadow mask manufactured from the shadow mask material 1 is of high quality with excellent hole dimension accuracy. When the camber K is 2 mm or less / 2 m, since the curvature is extremely small, the amount of extension of each side and each portion of the material based on the tension applied to the material 1 becomes more uniform. As a result, the shadow mask manufactured from such a shadow mask material 1 is of high quality with more excellent hole dimension accuracy.

On the other hand, if the camber K exceeds 3 mm / 2 m, the tension applied to both sides of the material may be difficult to be uniform, and the amount of extension of each side and each part of the material 1 based on the tension may not be uniform. There are cases. Therefore, even if the above-mentioned conditions (1) and (3) are satisfied, the amount of extension on each side and each part of the shadow mask material may be uneven due to the tension applied in the exposure step. As a result, the shadow mask manufactured from the shadow mask material may be inferior in the accuracy of the hole size, and may be deteriorated in quality.

Further, the shadow mask material 1 of the present invention
The dimensional change before and after the heat treatment is 0.015% or less in the rolling parallel direction and the rolling vertical direction. Even if the shadow mask manufactured from such a shadow mask material 1 is heat-treated at a prescribed temperature, the dimensional change before and after the heat treatment becomes 0.015% or less in the rolling parallel direction and the rolling vertical direction. Such a small dimensional change rate suppresses dimensional fluctuation of the manufactured shadow mask and improves its accuracy. For this reason, the shadow mask after being stretched and mounted in the cathode ray tube is of high quality with a small dimensional variation with respect to a predetermined identification hole interval. When the dimensional change rate is 0.010% or less,
Since the dimensional change before and after the heat treatment is extremely small, the dimensional change of the manufactured shadow mask can be further suppressed, and the accuracy thereof can be further improved.

On the other hand, if the dimensional change rate exceeds 0.015%, the dimensional variation of the shadow mask may increase when heat treatment is performed at a specified temperature, and the dimensional accuracy of the shadow mask may deteriorate. . Therefore, the above (1)
Even if the condition (2) is satisfied, the shadow mask after being mounted in the cathode ray tube may have a large amount of dimensional variation and a poor quality with respect to a predetermined discrimination hole interval.

The heat treatment is performed by using the shadow mask material 1
Is a heat treatment at about 650 ° C. or less, although it differs slightly depending on the type of the heat treatment. The purpose of the heat treatment at about 650 ° C. or less is that if the heat treatment is performed at a temperature exceeding the temperature, recrystallization or the like occurs, and the physical properties of the material itself change, which may greatly affect the physical properties of the material of the shadow mask. It is. At this time, the heat treatment environment and the heat treatment time are arbitrarily set from such a viewpoint.

It is preferable that the shadow mask material 1 of the present invention has been previously heat-treated under predetermined conditions that do not cause recrystallization. By performing such a heat treatment, the dimensional change rate can be set within the above range. At this time, the heat treatment under predetermined conditions that does not cause recrystallization is
In an atmosphere composed of a reducing gas such as a hydrogen-containing gas or an ammonia gas, a non-oxidizing gas such as a nitrogen gas or an inert gas, and the like, for example, in the case of aluminum killed steel generally used for an extended shadow mask, 450 650 ° C., preferably 540-580 ° C., for 120-3 seconds, preferably 60-40 seconds. By performing the heat treatment under these conditions, even if the shadow mask manufactured from the material is heat-treated at a prescribed temperature, the dimensional change before and after the heat treatment is 0.015% or less in the above-described rolling parallel direction and rolling perpendicular direction. Shadow mask material 1 can be obtained. Furthermore, this heat treatment can be called strain relief annealing, and can remove the distortion of the shadow mask material 1. It is considered that the removal of the strain based on the heat treatment greatly affects the dimensional change rate before and after the subsequent heat treatment. Note that the relationship between temperature and time is generally set such that the time is long when the temperature is low and the time is short when the temperature is high. The type of the annealing furnace is not particularly limited, and may be a continuous type or a box-type batch type.

When the temperature of the heat treatment is lower than 450 ° C., the dimensional change before and after the heat treatment may exceed 0.015%. If the temperature of the heat treatment exceeds 650 ° C., the shadow mask material 1 may be recrystallized, and the tensile strength may decrease. Such a decrease in tensile strength may cause the shadow mask to break when the manufactured shadow mask is mounted in a cathode ray tube.

As the shadow mask material 1 of the present invention, an aluminum killed steel material used as a general material for a stretch type shadow mask can be preferably used.
However, the material is not particularly limited to this material, and may be of any type as long as it has the above-described configuration based on the gist of the present invention and is preferable as a material for a stretchable shadow mask. Further, the thickness of the shadow mask material 1 is 2 which is suitable for a stretch type shadow mask.
It is about 5 to 130 μm.

As described above, the shadow mask material 1 of the present invention has excellent flatness and a small dimensional change rate before and after heat treatment, so that a shadow mask having excellent dimensional accuracy can be manufactured. Also in the subsequent heat treatment, the dimensional change before and after the treatment is small. Therefore, such a shadow mask material 1 is excellent in dimensional accuracy and can be used very suitably for manufacturing a shadow mask with little dimensional fluctuation.

When the shadow mask manufactured from the shadow mask material 1 is mounted in a cathode ray tube of a type in which a fluorescent screen is exposed and formed by a glass panel prepared in advance by an artwork, the shadow mask is mounted. The obtained cathode ray tube is of high quality with an extremely small dimensional variation with respect to a predetermined discrimination hole interval.

In such a shadow mask, the absolute value of the dimensional variation can be 55 μm or less, preferably 40 μm or less. A shadow mask having a dimensional variation amount within this range can accurately land an electron beam at a predetermined position.

The shadow mask 1 can be formed by the following conventionally known method, but is not limited to the following manufacturing method.

The shadow mask is usually formed in each step of photoetching, and is manufactured by a continuous in-line apparatus. For example, a water-soluble colloid-based photoresist or the like is applied to both surfaces of a thin metal plate and dried. Thereafter, a glass dry plate having a shape pattern of the above-described front side hole portion is adhered to the surface thereof, and a glass dry plate having a shape pattern of the back side hole portion is closely adhered to the back surface thereof, and ultraviolet rays such as high-pressure mercury And develop with water. In this exposure step, the shadow mask material of the present invention has an edge extension height T
And the camber K are within the predetermined range of the present invention, so that the amount of extension of each part of the material does not become uneven even by the tension applied in the exposure step. The positional relationship and the shape of the glass dry plate on which the pattern of the front side hole is formed and the glass dry plate on which the pattern of the back side hole is formed are determined by the positions of the front side hole and the back side hole formed on the obtained shadow mask. Designed and placed in consideration of relationships and their size. The exposed portion of the metal whose periphery is covered by the resist film image is formed in each of the shapes described above based on the difference in the etching progress rate of each portion. The etching process is performed by spraying a ferric chloride solution from both sides after heat treatment or the like. Thereafter, a shadow mask is manufactured by continuously performing post-processes such as washing and peeling. The shadow mask thus manufactured is subjected to a heat treatment under predetermined conditions and is stretched.

Since the shadow mask of the present invention has a small dimensional change before and after the heat treatment, a dimensional change is suppressed, and a high-quality shadow mask having excellent dimensional accuracy is obtained. A cathode ray tube equipped with such a shadow mask is very unlikely to cause a landing error.

[0037]

The present invention will be specifically described below with reference to examples and comparative examples.

An extended shadow mask was prepared in which the shadow mask was mounted in a cathode ray tube of a type not used for exposing the phosphor.

A rolled coil made of an aluminum-killed steel having a thickness of 50 μm was used as a material for the extended shadow mask. Next, the material was heat-treated under conditions that did not cause recrystallization. The heat treatment was performed at 540 to 560 ° C. for 45 seconds. At this time, 2 m of the heat-treated material was cut out, and the end extension height T and the camber K were measured. Then, it was subjected to a normal etching process to produce an extended shadow mask. With respect to the produced stretch type shadow mask, the dimensional change rate before and after the heat treatment and the dimensional change amount when the shadow mask was mounted in a cathode ray tube were measured.

(Evaluation Method) As shown in FIG. 3, the edge elongation height T is obtained by placing a shadow mask material 1 on a surface plate 2 and measuring the gap between the end surface Z and the surface plate 2 with a gap gauge 3. Was measured.

As shown in FIG. 4, the camber K is placed on the surface plate 2 with the shadow mask material 1 cut out in a length of 2 m along the rolling parallel direction, and the long side of the material 1 along the rolling parallel direction. The maximum gap between the straight line P connecting the side corners and the material 1 was measured.

The dimensional change rate was measured according to JIS-Z
Using the No. 5 test piece (250 mm length) in -2201, the length of the test piece before and after heat treatment in a box furnace in a reducing atmosphere at 490 ° C. for 60 minutes was measured and determined by the following method. The dimensional change rate is | (length of test piece before heat treatment)-
(Length of test piece after heat treatment) |） (length of test piece before heat treatment) × 100.

The amount of dimensional variation is expressed in X direction (vertical direction of rolling) 3
Using an aluminum-killed steel sample 5 (equivalent to a 17-inch shadow mask) having a thickness of 20 mm and a Y direction (rolling parallel direction) of 240 mm (a material equivalent to a 17-inch shadow mask), the X direction of the sample after heat treatment in a box furnace in a reducing atmosphere at 490 ° C. for 60 minutes. And the distance between the identification holes (6a to 6d) in the Y direction were measured (see FIG. 5). The amount of dimensional variation is | (interval of identification holes before heat treatment)-
(Interval between discrimination holes after heat treatment) | In FIG. 5, the measurement sample 5 is a 17-inch shadow mask-equivalent product formed to have the long side of the slot in the Y direction.

(Evaluation Results) A list of the obtained results is shown in Table 1.

[0045]

[Table 1]

As described above, the end elongation height is 3 mm or less, the camber is 3 mm or less / 2 m, and the dimensional change before and after the heat treatment is 0.00 in the rolling parallel direction and the rolling vertical direction.
Each of the shadow masks manufactured with the shadow mask material of 15% or less showed a dimensional variation of 55 μm or less. The shadow mask having the dimensional variation within this range was able to accurately land the electron beam at a predetermined position on the phosphor screen.

[0047]

As described above, according to the stretch type shadow mask material of the present invention, a shadow mask material having good flatness and small dimensional change before and after heat treatment can be obtained. By manufacturing a stretch-type shadow mask from a material, the dimensional accuracy and dimensional variation of the stretch-type shadow mask can be reduced, which is extremely effective in manufacturing a cathode ray tube in which landing errors are extremely unlikely to occur.

Further, according to the stretch type shadow mask of the present invention, a high-quality shadow mask having a small dimensional variation with respect to a predetermined interval between identification holes is obtained. As a result, the electron beam can be accurately landed at a predetermined position, which is extremely effective for manufacturing a cathode ray tube in which a landing error is extremely unlikely to occur.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a material for a stretchable shadow mask of the present invention.

FIG. 2 is an explanatory diagram of an end extension height.

FIG. 3 is an explanatory view showing an example of a method of measuring an end elongation height.

FIG. 4 is an explanatory diagram of a camber measurement method.

FIG. 5 is an explanatory diagram of a method for measuring an identification hole interval.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 material for stretch-type shadow mask 2 surface plate 3 gap gauge 5 identification hole interval measurement sample 6a, 6b, 6c, 6d identification hole X rolling vertical direction Y rolling parallel direction Z end face T end extension height K camber P straight line

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazutaka Iizuka 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 5C027 HH03 5C031 EE06 EF05 EH04 EH06 EH08

Claims (4)

[Claims] 1. A stretchable shadow mask material rolled to a predetermined thickness, wherein said stretchable shadow mask material has an end elongation height of 3 m.
m, the camber is 3 mm or less / 2 m, and the dimensional change before and after the heat treatment is 0.015% or less in the rolling parallel direction and the rolling vertical direction, and is characterized by being not more than 0.015%. 2. The material for an extended shadow mask according to claim 1, wherein the material for the extended shadow mask is heat-treated in advance under a predetermined condition that does not cause recrystallization. 3. An extended shadow mask manufactured from an extended shadow mask material rolled to a predetermined thickness, wherein the extended shadow mask material has an end elongation height of 3 m.
m, the camber is 3 mm or less / 2 m, and the dimensional change before and after the heat treatment is 0.015% or less in a rolling parallel direction and a rolling vertical direction, and is a stretchable shadow mask. 4. The stretchable shadow mask according to claim 3, wherein a dimensional variation of the stretchable shadow mask before and after the heat treatment is 55 μm or less.