JPH0789472B2 - Color picture tube and material for parts thereof and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a color picture tube, a material for the color picture tube, and a method for manufacturing the same, and more particularly, a shadow mask and a mask frame for interior parts mainly containing Fe and Ni of the color picture tube. And the inner shield.

[Technical background of the invention and its problems]

FIG. 1 shows a schematic structure of a color picture tube. In this type of color picture tube, a so-called neck portion 2 of the glass envelope 1 is provided with, for example, a plurality of in-line arranged electron guns 3, and a face portion 4 facing the electron guns 3 is provided with red, blue,
It has a structure in which a fluorescent surface 5 divided into green is provided. And
A sheer dough mask 6 having a large number of beam apertures near the fluorescent surface 5 is fixedly arranged on the frame 7 by using a locking tool 8. An inner shield 9 is attached to the frame 7 for blocking the adverse effect of geomagnetism. In the figure, 10 is a deflector.

Therefore, in the color picture tube having the above structure, the electron beam 11 emitted from the electron gun 3 is focused and accelerated, and the deflector 10
Thus, the face portion 4 is deflected and scanned. Then, the electron beam 11 collides with the fluorescent surface 5 through the shear mask 6 and exhibits a predetermined color.

By the way, conventionally, the shadow mask 6, the frame 7, the inner shield 9 and the like in this type of color picture tube are generally made of a metal containing Fe as a main component, and have a structure in which a black oxide film is formed on the surface thereof. . This oxide film is for preventing rusting after forming the member, for increasing the heat radiation effect during operation, and for reducing electron beam reflection. However, when the color picture tube is operated, the above-mentioned member temperature rises by about 30 to 100 ° C. Therefore, for example, in the shear mask 6, a dormancy drift (PD) occurs due to the doming caused by the thermal expansion. This purity drift is a major obstacle to realizing "fineness" and "visibility" of a color image.

Therefore, recently, it has been attempted to use an expensive Fe-Ni alloy having a small coefficient of thermal expansion, such as amber, instead of Fe described above as a material of the shear mask 6 or the like. However, this type of Ni-Fe alloy has poor thermal conductivity, and not only is it easy to store heat, but is also likely to have a recess from the usual spherical surface of the shadow mask to the electron gun side, so-called spring back. Therefore, the need for Ni-Fe alloy shear masks that are easy to form has arisen.

Usually, a sheer dough mask is made by the following steps. The material is first obtained as a flat mask having a large number of beam openings through the steps of applying a photosensitive agent, exposing, developing, burning, and etching. After the flat mask is washed, dried, and sheared, a curved mask is formed by annealing press molding, and a black film is formed in an oxidizing atmosphere to complete a shadow mask. The frame, inner shield, and bimetal have no etching or blackening, and are manufactured through substantially the same manufacturing process.

A color picture tube is manufactured by incorporating these parts, but especially in the case of high definition, it is desired to improve the molding quality, so the spring back as shown above causes a large color shift of the screen. It can be a cause.

[Object of the Invention]

The present invention has been made in consideration of such circumstances,
An object of the present invention is to improve the moldability of at least one of the components mainly composed of Fe and Ni of the shadow mask, the mask frame and the inner shield built in the color picture tube.

[Outline of Invention]

INDUSTRIAL APPLICABILITY The present invention collects a rolled surface of a metal material of a Fe-Ni alloy of a face-centered cubic lattice used for a shadow mask, an inner shield, and a mask frame used for a color picture tube into a {111} crystal plane to form a part with good molding quality. It is characterized by providing and obtaining a detailed image. The description will be given below by taking a shear mask as an example.

As described above, the shear mask is a flat mask with a large number of beam passage holes formed by etching.
Obtained by blackening. It is said that plastic anisotropy occurs in this forming, and this usually occurs because the slip system that is active changes depending on the preferential direction when the metal plate is deformed.
In other words, if the metal plates are aggregated in a certain crystal orientation, the squeezing process during molding can be performed accurately.

Table 1 shows the relationship between the spring back value and the crystal orientation of the shadow mask used for the 14-inch color picture tube. For metal materials, vacuum melting, forging, hot rolling, cold rolling, and annealing were repeated, and the Ni content was extended to 0.2 mmt.
It uses Fe. The annealing after etching is 10 ^-2 Torr.
It is performed at 1100 ℃ in vacuum. The crystal orientation ratio is normal X
(111), (200), obtained by line diffraction pattern
From the peak intensity ratios corresponding to (220) and (211), {11
The ratio of 1}, {100}, {110}, and {211} is calculated. From this table, it can be seen that the spring back value is low when they are gathered in the {111} crystal orientation, which is suitable for precision machining.

The reason why the crystal structure has a face-centered cubic lattice of 70% or more is that the Fe-Ni alloy having a face-centered cubic lattice of 70% or less usually has a large coefficient of thermal expansion and is unsuitable as a shear mask. This is because it is difficult to collect crystal orientations, and etching unevenness due to a difference in crystal structure easily occurs during etching.

Table 1 is calculated from the X-ray diffraction pattern for the sake of clarity, but the degree of aggregation of the crystal planes in the present invention is expressed as follows. That is, the component in the direction of the {111} crystal axis of each grain of the polycrystal in the direction perpendicular to the mask surface is defined by the following amount in the ratio of all crystallinity.

Here, Vφ is the volume ratio of grains, and φ is the angle formed by the mask surface vertical direction and the {111} crystal axis.

No. 8 to 12 shown in the grain size and JIS-G0551 are 8
This is because if the etching hole is made smaller, a part without holes may be formed in a smaller part, and if it is larger than 12, the etching hole is not even in the rolling direction and the direction perpendicular to the rolling direction. This particle size is preferably No. 9-11.

Now, with regard to the manufacturing method of material for parts, the texture is closely related to the rolling rate. FIG. 2 was obtained in the same manner as in Table 1.
It is the rolling ratio and the peak intensity of the X-ray diffraction pattern when a 2Cr-36Ni-Fe plate is rolled. In the figure, curve 12 shows the {111} crystal plane, curve 13 shows the {100} crystal plane, and curve 14 shows the {110} crystal plane. Since the peak strength attributed to (200) is strong if materials with approximately the same peak strength after annealing are strongly processed, the peaks that belong to {100} are strong or the peaks attributed to (111) are strong when weakly processed. The crystal orientation aggregated in 111} appears. However, if the material aggregated in {111} is further strongly worked, the crystals rotate and align with the {100} crystal orientation. Therefore, after assembling in {111}, the material should not be heavily worked. From this, the upper limit of the rolling rate was set to 70%, and a rolling rate of 30% or less was selected in the final rolling. After all, after hot rolling, cold rolling maintaining a rolling ratio of about 30 to 60% is performed, annealing is performed after each rolling, and the final two rollings are performed within a range not exceeding 30%. desirable.

This applies to the Fe-Ni alloy containing Mn or Co instead of Cr and also to the Fe-Ni alloy containing no third additive element. Further, the contents described above can be applied not only to the inner shield and the mask frame but also to 42Ni-Fe used for the lead frame.

Example of Invention

 Next, examples of the present invention will be described.

Example-1 First, 36% Ni and Fe are main components, and C is an auxiliary component.
0.005wt%, Si 0.01wt%, and P and S respectively
Alloy ingots containing 0.001 wt% each were prepared by vacuum melting. Next, this ingot was repeatedly hot rolled, pickled and subjected to primary and secondary cold rolling. The rolling rate in this treatment was 40%.

Then, in a box-type annealing furnace, after annealing the metal material subjected to the above-mentioned rolling treatment at 10 _-4 torr and 800 ° C, the rolling rate is 20%.
Conditioned rolling was carried out in order to gather the rolled surfaces into {111}. By this adjusted rolling, a raw material for in-pipe parts having an austenite structure with a grain size of 10 specified in JIS-G0551 was obtained.

Using the thus-produced material for in-pipe parts, a sheer dough mask was manufactured as follows.

First, a photoresist was applied to both surfaces of the metal material, dried, and then a film having a slot or dot-shaped reference pattern formed thereon was adhered to both surfaces thereof to expose and develop the photoresist. By this development, the photoresist in the unexposed portion is dissolved and removed. After that,
After the remaining photoresist was burned and hardened, it was etched with a ferric chloride solution at 50 ° C., and then the residual resist was removed with hot alkali to prepare a flat mask to be a master of the shadow mask.

Put this Furatsutomasuku a vacuum heating furnace of the box-type, 10 ^-4-to
After removing the strain and improving the workability by annealing in an atmosphere of rr and 1000 ° C, the flat mask is passed through a leveler after this annealing to remove the plate strain, and at the same time reduce the stretch strain in the forming process. It was The vacuum annealing was performed for the purpose of reducing the amount of dissolved C in the flat mask and reducing the 0.2% proof stress due to the coarsening of the crystal grain size. This facilitates subsequent press molding.

Next, the flat mask was press-molded to obtain a sheer dough mask having a predetermined curved surface. At this time, it was confirmed that the 0.2% proof stress was small, the moldability was extremely good, and spring backing did not occur. At the same time, it was also confirmed that the characteristics of the shear mask in the width direction and the length direction were uniform, and there was no occurrence of moldability defects due to so-called variations in the characteristics.

After that, the above shed mask was washed with trichloroethylene vapor and heated in a continuous blackening furnace maintained at 700 ° C. for 20 minutes to grow a blackened film having good adhesion to a thickness of 1.5 μm to complete the shed mask. We also attached this sheer dough mask to the frame and to the panel via bimetal. After coating red, blue, and green phosphors corresponding to the electron beam passage holes and evaporating Al to increase the reflectance,
It was joined with an electron gun and a funnel with a deflection yoke, and the inside was evacuated to complete a color picture tube.

Example-2,3 36% Ni and Fe as main components, 2 wt% of Cr or 2 wt% of Mn, and 0.05 wt% of C, 0.02 wt% of Si, and 0.001 of P and S respectively as additional components. An alloy ingot containing each wt% was prepared. After hot rolling, cold rolling was repeated at a rolling rate of 20% in the same manner as in Example 1 to complete a 0.2 mm thick thin plate. During each rolling, vacuum annealing was performed at 900 ° C. and 10 ⁻⁴ Torr. Is being done. A shadow mask was formed from this metal material in the same manner as in [Example-1].

Also in this example, it was confirmed that spring backing did not occur and the moldability was extremely good.

Furthermore, a color picture tube was completed by the same method.

〔The invention's effect〕

Thus, according to the present invention, a predetermined Ni-Fe-based metal plate with {11
1} The crystal planes are aggregated to improve the formability, and the etching property is improved by adjusting the crystal grain size and the metallographic structure, so that it is very effective as a material for producing a shadow mask. it can. Moreover, the conventional 36
Unlike Ni-Fe alloys, there is no need to perform vacuum annealing at high temperature, and the trouble of warm pressing is eliminated. And 1200
Annealing at a temperature of not more than 0 ° C. makes it possible to perform the forming process sufficiently, and it is possible to shorten the etching process time and obtain uniform etching holes.

Further, the coefficient of thermal expansion is 90 × 10 ⁻⁷ / ° C. or less, and can be made smaller than that of conventional Al-killed steel and rimmed steel. Therefore, it is possible to easily realize a color picture tube with little color shift.

Furthermore, if it is completed as a color picture tube, the display image will be bright, the contrast will be strong, the color shift at the four corners of the screen will be small, and a good color image with little image distortion and reflection of external light can be displayed. A picture tube can be realized. That is, a color picture tube capable of displaying a high-quality image can be manufactured easily and with a high yield, which is a great effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing a schematic structure of a color picture tube, and FIG. 2 is a diagram showing a rolling rate of 2Cr-36Ni-Fe and crystal planes gathered on the rolling surface. (1) …… Enclosure, (2) …… Net part (3) …… Electron gun, (4) …… Face part (5) …… Fluorescent surface, (6) …… Sheath mask (7)… … Mask frame, (8) …… Locking tool (9) …… Inner shield, (10) …… Deflecting device (11) …… Electron beam

Continued Front Page (72) Inventor Isao Suzuki Komukai Toshiba-cho 1 Kawasaki-shi, Kanagawa 1 Inside Toshiba Research Laboratories (56) Reference JP-A-58-81926 (JP, A)

Claims (6)

[Claims] 1. An electron gun provided at one end in an envelope,
A fluorescent screen provided at the other end facing the electron gun, a shadow mask provided in the vicinity of the fluorescent screen and having a large number of apertures attached to a frame, and an inner shield attached to the shadow mask In a color picture tube including: at least one of the frame, the shadow mask and the inner shield,
A component made of a metal material that contains Fe and Ni as main components and has an oxide film on the surface, and 70% or more of the crystal grains have a face-centered cubic structure. A color picture tube characterized by having more than 30% of (111) crystal faces. 2. The component contains 0 to at least one of Cr, Mn and Co.
Claim 1 containing 10% by weight of Fe and Ni as main components.
Color picture tube in paragraph. 3. A metal material used for a color picture tube component containing Fe and Ni as main components, in which 80% or more of crystal grains have a face-centered cubic structure, and (111) crystals are present on the surface. Face 30
A material for color picture tube parts, which is characterized by being assembled by more than 100%. 4. The grain size of the metal material used for the component is
The material for color picture tube parts according to claim 3, which is No. 8 to 12 defined by JIS-0551. 5. The component contains 0 to at least one of Cr, Mn and Co.
The material for color picture tube parts according to claim 3, containing 10% by weight. 6. A material for color picture tube parts, which comprises Fe and Ni as main components, is subjected to cold rolling at least twice after hot rolling and annealing at a recrystallization temperature or higher, and each rolling exceeds 70%. By rolling at a rolling rate that is not present and performing final rolling at 30% or less, 70% or more of the crystal grains have a face-centered cubic structure, and the (111) crystal plane is 30% or more on the surface of the metal material. A method of manufacturing materials for color picture tube parts, which is characterized by being assembled.