JP2003229069A - Panel pin and glass panel for cathode-ray tube using this panel pin and cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve glass wettability and adhesion of an oxide film, to enhance sealing performance of a panel pin, to prevent the occurrence of a glass crack, to restrain mislanding of an electron beam caused by a shortage of sealing strength of the panel pin, and to improve a manufacturing yield. <P>SOLUTION: The oxide film is formed in at least a glass sealing part of the panel pin 1 for holding a shadow mask or an aperture grill. (1) The panel pin is 10 μm or less in a waviness component Wt in surface roughness measurement on the oxide film. (2) The panel pin is 0.1 to 3 μm in arithmetic means roughness Ra, and is 2 to 14 μm in ten-point average roughness Rz in the surface roughness measurement on the oxide film. (3) The panel pin is 0.1 to 3 μm in the Ra in the surface roughness measurement on the oxide film, and is larger in the arithmetic means roughness (the Ra outside) of a sealing part outside surface of the panel pin than the Ra inside of a sealing part inside surface of the panel pin. (4) This glass panel for a cathode-ray tube has the panel pin. (5) The cathode-ray tube is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel pin, a glass panel for a cathode ray tube using the same, and a cathode ray tube, and more particularly to a panel pin having excellent glass sealing strength and preventing the generation of glass cracks, and a cathode ray using the same. The present invention relates to a glass panel for a tube and a cathode ray tube.

[0002]

2. Description of the Related Art A cathode ray tube (CRT) used as a color television or a computer terminal display is
Generally, it has a structure as shown in FIG. That is, the cathode ray tube for a color television includes a strip-shaped panel (face plate) 32 and a funnel-shaped funnel 33.
And a vacuum envelope consisting of a neck 34.

On the inner surface of the panel (face plate) 32, the three primary colors of red (R), green (G) and blue (B).
The light emitting phosphor layer 35 is formed in a stripe shape or a dot shape, and an electron gun 37 for emitting an electron beam 36 corresponding to red, green, and blue is provided inside the neck 34. A shadow mask 38 having a large number of fine holes is supported and fixed to the inner surface of the panel 32 via panel pins 30 at a position close to and facing the phosphor layer 35.

The electron beam 36 accelerated by a constant voltage in the three electron guns 37 corresponding to the phosphors of each emission color (B, G, R) is converged by the electron lens 40, and further, the deflection yoke. The course is bent by 41. Then, the three electron beams that have passed through the shadow mask 38 are selectively applied to the phosphor layer 35 to be excited and emitted, and a color image of any color is reproduced by additive color mixture of the respective emitted lights.

In the cathode ray tube as described above, the shadow mask 38 is held and fixed by a supporting structure as shown in FIG. That is, the panel pin 30 having a substantially cylindrical shape
Is heated to a high temperature of 900 ° C. or higher to form an oxide film on the surface of the panel pin, and then the base end portion of the panel pin 30 heated to a high temperature exceeding the working temperature of the glass panel,
As shown in FIG. 4, the panel pin 30 is pushed into a predetermined position on the inner surface of the side wall 32a of the glass panel 32, and the panel pin 30 is sealed and fixed to the side wall 32a of the panel 32 by the molten glass.

The shadow mask 38 has a rectangular mask frame 38a attached to the periphery of its main body.
The mask frame 3 is provided so that the shadow mask body faces the phosphor layer 35 at a predetermined distance.
At least the side wall of 8a is supported by the panel side wall 32a via the elastic holder 39. Each holder 39 is
One end fixed to the mask frame 38a and the panel 3
The second side wall 32 a has the panel pin 30 provided on the inner surface of the second side wall 32 a and the other end portion engaged with the panel pin 30.

For panel pins, ferritic stainless steel such as 18 wt% Cr-Fe alloy, which has a thermal expansion coefficient similar to that of special glass for cathode ray tubes, is widely used.
When such a ferritic stainless steel is used as a panel pin, it is usually processed into a panel pin shape from a ferritic stainless material and then heat-treated in, for example, a wet hydrogen atmosphere, and its surface has excellent wettability with glass. An oxide film is formed and, in this state, it is sealed to the glass panel of the cathode tube.

[0008]

In recent years, the weight of shadow masks has increased due to the increase in size of cathode ray tubes.
Since the load applied to the panel pins is increasing, it is important to maintain the precision of supporting and fixing with the panel pins, and the maintenance of the precision is becoming more important with the demand for higher definition.
In particular, with the demand for larger size and higher definition of the cathode ray tube, the demand for the problem of mislanding that causes color misregistration has become stricter.

The above-mentioned panel pin made of ferritic stainless steel has a thermal expansion coefficient close to that of glass, and the oxide film formed on the surface of the panel pin improves the wettability with glass. In order to meet the demand for weight increase and high definition due to the size increase of the cathode ray tube as described above, it is required to improve the glass wettability and further improve the sealing strength thereof. Further, in the heat treatment step in the cooling step or the assembling step of the cathode ray tube after sealing the panel pin to the glass, and further in the repeated temperature change when used in the cathode ray tube, the occurrence of glass cracks is prevented. , Precise positioning is also possible,
It is becoming more and more important as the shadow mask becomes larger and heavier.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by specifying the surface texture of the glass sealing portion of the panel pin,
It is an object of the present invention to provide a panel pin that is easy to process, has excellent strength, has good glass sealing properties, and effectively prevents the occurrence of glass cracks. Another object of the present invention is to provide a glass panel for a cathode ray tube and a cathode ray tube in which the use of the panel pins suppresses the occurrence of initial defects, defective displacement of the shadow mask, and the like.

Therefore, the panel pin according to the present invention of claim 1 is a panel pin for holding a shadow mask or an aperture grill, which is sealed to a cathode ray tube panel, and an oxide film is formed on at least the glass sealing portion of the panel pin. Is formed, and the waviness component (Wt) in the surface roughness measurement on the oxide film is 10 μm or less.

A panel pin according to a second aspect of the present invention is a panel pin for holding a shadow mask or an aperture grill, which is sealed to a panel for a cathode ray tube.
An oxide film is formed on at least the glass sealing portion of the panel pin, and the arithmetic average roughness (Ra) in the surface roughness measurement on the oxide film is 0.1 to 3 μm and the ten-point average roughness (Rz). 2) is 2 to 14 μm.

A panel pin according to a third aspect of the present invention is a panel pin for holding a shadow mask or an aperture grill, which is sealed to a panel for a cathode ray tube.
An oxide film is formed on at least the glass sealing part of the panel pin, and the arithmetic mean roughness (Ra) in the surface roughness measurement on the oxide film is 0.1 to 3 μm. Is larger than the arithmetic average roughness (inside Ra) of the inner surface of the sealing portion of the panel pin.

In the panel pin according to the present invention of claim 4, the arithmetic mean roughness of the outer surface of the sealing portion of the panel pin (outside Ra) and the arithmetic mean roughness of the inner surface of the sealing portion of the panel pin (inside Ra).
The panel pin according to claim 3, wherein the ratio (outside Ra) / (inside Ra) is 1.1 to 2.

According to the fifth aspect of the present invention, the panel pin comprises 15 to 30% by weight of chromium, 0.01 to 1% by weight of aluminum, 0.1 to 1% by weight of silicon, and 0.1 to 1% by weight of titanium.
The panel pin according to any one of claims 1 to 4, wherein the balance and the balance are formed of a sealing alloy consisting essentially of iron.

A glass panel for a cathode ray tube according to a sixth aspect of the present invention is the glass panel for a cathode ray tube, wherein the sealing portion is fusion-welded to the inner surface of the panel of the cathode ray tube and the holder supporting portion is the peripheral portion of the shadow mask or the aperture grill. And a panel pin for fixing the peripheral edge portion of the shadow mask or the aperture grill to a predetermined position by joining the panel pin to the shadow mask or the aperture grill, the panel pin according to any one of claims 1 to 5.

The cathode ray tube according to the present invention of claim 7 is arranged such that a vacuum envelope having a panel, a phosphor layer provided on the inner surface of the panel, and a position facing the panel of the vacuum envelope. An electron gun, a shadow mask or aperture grill disposed between the phosphor layer and the electron gun, a sealing portion is fused to the inner surface of the panel of the cathode ray tube, and a holder supporting portion is a shadow mask or aperture. A panel pin for fixing the peripheral edge portion of the shadow mask or the aperture grill to a predetermined position by being joined to the peripheral edge portion of the grill, wherein the panel pin is any one of claims 1 to 5. It is a thing.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing the shape of the panel pin of the present invention. FIG. 2 is a sectional view showing a sectional shape of the panel pin shown in FIG.

The panel pin according to the present invention relates to a panel pin for holding a shadow mask or an aperture grill sealed to a cathode ray tube panel. Such a panel pin 1 of the present invention has a substantially cylindrical shape as shown in FIG. Here, 2 is a holder support part, and 3 is a glass sealing part. As shown in FIG. 2, the glass sealing portion 3 has an outer surface (3
It can be classified into the outer) and the inner surface of the panel pin (inside 3).

An oxide film 4 is formed on at least the glass sealing portion 3 of the panel pin 1. The oxide film 4 does not need to be formed only on the glass sealing portion 3, and is also formed on portions other than the glass sealing portion (for example, the holder supporting portion 2 and the non-glass sealing portion 5 inside the panel pin). It may have been done. The formation of the oxide film is usually carried out by heat treatment, but it may be difficult in operation to form the oxide film only on the glass sealing portion 3 of the panel pin by such normal heat treatment, while the holder support portion 2 and the like are provided. Even if the oxide film is formed on the panel pin, the function as the panel pin is not substantially adversely affected. Therefore, as shown in FIG.
Generally, it is also formed in other portions, for example, the holder supporting portion 2 and the non-glass sealing portion 5 inside the panel pin.

As described above, the first panel pin according to the present invention is a panel pin for holding the shadow mask or the aperture grill sealed to the cathode ray tube panel, and at least the glass sealing portion of the panel pin has an oxide film. Is formed, and the waviness component (Wt) in the surface roughness measurement on the oxide film is 10 μm or less.

Here, "waviness component (Wt)" means JI
It is defined by SB0601-2001, and is specifically determined by the following measuring method.

The undulation curve was measured at four points evenly on the oxide film in the circumferential direction of the panel pin, and was obtained by the sum of the maximum peak height and the maximum valley height obtained from this undulation curve (obtained by the above definition. ) Let the average of Wt be the value of the present invention. The average value of Wt is the value of the present invention.

When the waviness component (Wt) exceeds the above range, stress concentration due to thermal strain after sealing the panel pins becomes large, and glass cracks are likely to occur.
In the present invention, the waviness component (Wt) is 8 μm or less, especially 5 μm.
It is preferably m or less.

Particularly preferable panel pins in the present invention are those in which substantially the entire range of the glass-sealed portion satisfies the above-mentioned requirements, but the waviness component (Wt) in any part of the oxide film of the glass-sealed portion is If the above requirements are satisfied, the effect of the present invention can be expected. The value of the waviness component (Wt) does not have to be the same in all parts of the oxide film of the glass-sealed part. For example, the outer sealing portion and the inner sealing portion of the panel pin may be different.

As described above, the second panel pin according to the present invention is a panel pin for holding the shadow mask or the aperture grill sealed to the cathode ray tube panel, and at least the glass sealing portion of the panel pin has an oxide film. And the arithmetic mean roughness (Ra) in the surface roughness measurement on the oxide film is 0.1 to 3 μm and the ten-point mean roughness (Rz) is 2 to 14 μm.
It is characterized by.

The "arithmetic mean roughness (Ra)" and the "ten-point mean roughness (Rz)" are JIS B0, respectively.
It is defined by 601-1994, and is specifically obtained by the following measuring method.

Roughness curves are measured at four uniform locations on the oxide film in the circumferential direction of the panel pin. Then, Ra was obtained by extracting the reference length L from the roughness curve in the direction of the average line and averaging the absolute values of the deviations from the average line of the extracted portion to the measurement curve (obtained by the above definition. The average of Ra) is taken as the value of the present invention. Further, Rz is the average value of the absolute values of the elevations (Yp) of the peaks from the highest peak to the fifth peak from the average line of this extracted portion, extracted from the roughness curve in the direction of the average line. When,
The average value of Rz (obtained by the above definition) obtained from the sum of the absolute values of the altitudes (Yv) of the fifth to the lowest valley bottoms and the average value thereof is taken as the value of the present invention.

The "arithmetic mean roughness (Ra)" of the panel pin of the present invention is 0.1 to 3.0 μm, preferably 0.3 to 1.5 μm, more preferably 0.5 to 1.2 μm.
m. If the arithmetic average roughness (Ra) exceeds the above range, the glass sealing strength is good, but glass cracks easily occur, while if it is less than the above range, the occurrence of glass cracks is effective. However, it is difficult to obtain sufficient sealing strength.

The "ten-point average roughness (Rz)" is 2 to
14 μm, preferably 3 to 10 μm, more preferably 4
˜8 μm. When the ten-point average roughness (Rz) exceeds the above range, glass cracks are likely to occur although the sealing strength with glass is good, while when it is less than the above range, glass cracks are generated. Although effectively prevented, it becomes difficult to obtain sufficient sealing strength.

Particularly preferable panel pins in the present invention are those in which substantially the entire range of the glass-sealed portion satisfies the above-mentioned requirements, but the arithmetic mean roughness (Ra) is measured in any part of the oxide film of the glass-sealed portion. ) And ten-point average roughness (Rz)
If the above condition is satisfied, the effect of the present invention can be expected. Moreover, the values of the arithmetic average roughness (Ra) and the ten-point average roughness (Rz) do not have to be the same in all parts of the oxide film of the glass sealing part. For example, the outer sealing portion and the inner sealing portion of the panel pin may be different.

As described above, the third panel pin according to the present invention is a panel pin for holding the shadow mask or aperture grill sealed to the cathode ray tube panel, and at least the glass sealing portion of the panel pin has an oxide film. Is formed, the arithmetic mean roughness (Ra) in the surface roughness measurement on the oxide film is 0.1 to 3 μm, and the arithmetic mean roughness (Ra) of the outer surface of the sealing portion of the panel pin (Ra) is
Outside) is the arithmetic average roughness (R
It is larger than (in a).

Here, the "arithmetic mean roughness (Ra)" is defined by JIS B0601-1994 similarly to the above, and is obtained by the above measuring method.

The "arithmetic mean roughness (Ra)" is 0.1 to 3.0 μm, preferably 0.3 to 3.0, as in the above.
The thickness is 1.5 μm, more preferably 0.5 to 1.2 μm. If the arithmetic mean roughness (Ra) exceeds the above range, glass cracks are likely to occur although the sealing strength with glass is good, while if less than the above range, glass cracks occur. However, it is difficult to obtain sufficient sealing strength.

The ratio (outside Ra) / (inside Ra) of the arithmetic mean roughness (outside Ra) of the outer surface of the sealing portion of the panel pin and the arithmetic average roughness (inside Ra) of the inner surface of the sealing portion of the panel pin is: 1.
1-2 is preferable, and more preferably 1.2-1.9,
Particularly preferably, it is 1.3 to 1.7. When it is less than 1.1, the effect and object of the present invention cannot be sufficiently achieved, while when it is more than 2, the roughness of the outer surface of the sealing portion becomes relatively rough so that the shadow mask (aperture) This is because the desorption of the grill is not smooth.

As in the present invention, the arithmetic mean roughness is made different between the outer surface (inside 3) and the inner surface (outside 3) of the sealing portion of the panel pin to seal the arithmetic mean roughness (outside Ra) of the outer surface. The reason why the generation of glass cracks is effectively prevented by increasing the arithmetic mean roughness (in Ra) of the inner surface of the welded part is that the glass wettability of the oxide film is improved and the bonding area thereof is increased. It is considered that this is because the joint strength between the glass and the glass and the joint strength between the oxide film and the glass were further improved, and the stress concentration near the panel pin fused portion was relaxed.

The reason why the stress is generated in the vicinity of the fused portion of the panel pin is that the temperature change conditions in the sealing step and the cooling step or the subsequent heat treatment step are different between the inside and the outside of the panel pin. The thermal expansion and contraction characteristics of the glass differ between the inside and outside of the panel pin, and the stress applied to the glass is not large due to the shape of the panel pin, and the direction of the stress is different between the outside and inside of the panel pin. Etc. can be mentioned. That is, since the panel pin formed from the sealing alloy material often has higher thermal conductivity than glass, heat shrinks earlier than glass, and the glass inside the panel pin is stressed in the compression direction due to the shrinkage of the glass pin. On the other hand, it is conceivable that the glass outside the panel pin will be subjected to tensile stress, and the glass outside the panel pin will be cooled by the external atmosphere while the glass inside the panel pin will be in a closed environment and thus will be cooled slowly.
When the stress is generated and its concentration is large, glass cracks are generated in the sealing step and the subsequent heat treatment step and the sealing strength of the panel pin is unavoidably lowered.
In addition, when the panel pin is sealed to the glass, gas is enclosed inside the glass and the internal pressure rises, which reduces the wetting of the glass on the inner surface of the panel pin and reduces the adhesion and bonding strength with the glass. It seems that there was.

In the present invention, the arithmetic mean roughness (Ra) in the surface roughness measurement on the oxide film of the panel pin is 0.1 to 3
Within the range of μm, the adhesion strength between the panel pin and the oxide film improves as the value of the arithmetic mean roughness increases,
It has been confirmed that the wettability between the oxide film and the glass is improved when the value of the arithmetic mean roughness becomes small. In the panel pin according to the present invention, the outer surface of the sealing portion of the panel pin has an arithmetic mean roughness (outside Ra) larger than an arithmetic mean roughness of the inner surface of the sealing portion of the panel pin (inside Ra) so that the outside surface of the panel pin is outside. By making both the surface and the inner surface have optimum surface characteristics, the fusion strength of the panel pin is improved and the occurrence of glass cracks is prevented.

The first to third panel pins described above can be formed from a sealing alloy material which has been conventionally used in this type of panel pin. Examples of preferable sealing alloys in the present invention include iron (Fe) -chromium (Cr) based alloys, and particularly chromium (Cr) 15 to
30% by weight, 0.01 to 1% by weight of aluminum (Al), 0.1 to 1% by weight of silicon (Si), titanium (Ti)
A preferable example is 0.1 to 1% by weight and the balance substantially Fe.

Here, Cr is a component that lowers the thermal expansion coefficient of the Fe-based alloy and approximates the thermal expansion coefficient to the thermal expansion coefficient of the special glass constituting the panel, and if the content of Cr is outside the above range. In any of these cases, the difference in the coefficient of thermal expansion from the special glass forming the panel pin becomes too large, and the characteristics of the special glass as a sealing component deteriorate. Further, if the Cr content exceeds 30% by weight, mechanical properties such as elongation also deteriorate. Cr is also a main component of the surface oxide film, whereby a surface oxide film having excellent wettability with respect to glass can be obtained.

Al is a component that improves the adhesion between the surface oxide film and the sealing portion of the panel pin. If the content of Al is too small, the effect of improving the adhesion of the surface oxide film is low. If the content of is too large, the coefficient of thermal expansion may be changed, and the strain or the like may increase during sealing, so the above range is preferred. The content of this Al is 0.2-
It is more preferable to set it in the range of 0.5% by weight.

Si is a component which forms an oxide layer mainly composed of SiO ₂ on the lower side of the surface oxide film in the oxidation treatment to enhance the adhesion between the surface oxide film and the sealing portion of the panel pin. If the content is too small, the effect of improving the adhesiveness of the surface oxide film is low. On the contrary, if the content is too large, the coefficient of thermal expansion may be changed to increase the strain or the like in the sealed portion.

Further, like Al, Ti has a function of improving the adhesion between the surface oxide film and the sealing portion of the panel pin and fixing harmful C and N, and mainly comprises an internal oxide. If the Ti content is too low, the effect of improving the adhesion of the surface oxide film is low, and if the Ti content is too high, the workability may be reduced. The content of Ti is 0.15 to 0.5% by weight
It is more preferable to set the range to.

In the present invention, if necessary, Mn
A small amount of Ni, Ni, etc. may be contained. These elements contribute to improving the workability of the sealed portion and adjusting the thermal expansion characteristics. C and nitrogen (N) are Fe-Cr.
Since the workability of the base alloy may be deteriorated, the content of each of them is preferably less than 0.01% by weight.

For a panel pin molded from such a material, (1) a method of setting the waviness component (Wt) in the surface roughness measurement on the oxide film to 10 μm or less, (2) a surface roughness measurement on the oxide film The arithmetic mean roughness (Ra) is 0.
1-3 μm and ten-point average roughness (Rz) of 2-14
(3) Like the third panel pin, the arithmetic mean roughness (Ra) in the surface roughness measurement on the oxide film is 0.1 to 3 μm, and the outer surface of the sealing portion of the panel pin is A method of making the arithmetic average roughness (outside Ra) larger than the arithmetic average roughness (inside Ra) of the inner surface of the sealing portion of the panel pin can be performed by any general method. If necessary, after the oxide film is formed, a post-treatment may be performed so that the surface characteristics thereof become the above-mentioned preferable ones.

The oxide film is formed by subjecting the panel pin, which has been subjected to the above-mentioned appropriate treatment, to a heat treatment at a temperature of 900 to 1400 ° C., for example, in a wet hydrogen atmosphere.
That is, it can be formed by performing an oxidation treatment. By such an oxidation treatment, a surface oxide film containing Cr oxide as a main component at least on the surface of the sealing portion 3 of the panel pin and having excellent wettability with respect to glass can be obtained.

Next, the cathode ray tube according to the present invention will be described. An example of an embodiment of the cathode ray tube according to the present invention is shown in FIGS. 3 and 4. The cathode ray tube 11 according to the present invention has a vacuum envelope including a short glass panel (face plate) 12, a funnel-shaped funnel 13 and a neck 14. The inner surface of the panel (face plate) 12 has three primary colors of red (R), green (G), and blue (B).
The light emitting phosphor layer 15 is formed in a stripe shape or a dot shape, and an electron gun 17 for emitting an electron beam 16 corresponding to red, green, and blue is provided inside the neck 14.

Further, a shadow mask 18 having a large number of fine apertures is arranged at a position close to and facing the phosphor layer 15, and a rectangular mask frame 18a is provided around the shadow mask 18.
And an elastic holder 19 is attached to the mask frame 18a. Shadow mask 18
Is fixed by locking the other end of the elastic holder 19 to the panel pin 1 of the present invention provided on the inner surface of the side wall 12a of the panel 12. The electron beam 16 accelerated in the electron gun 17 at a constant voltage is converged by an electron lens 20, further bent by a deflection yoke 21, and the electron beam passing through the shadow mask 18 is selectively phosphor layer. The image is irradiated with 15 and excited to emit light, and a color image of all colors is reproduced by the additive color of each color.

The panel pin 1 according to the present invention, as shown in FIG. 4, is obtained by pushing the sealing portion of the panel pin 1 heated to a high temperature exceeding the working temperature of the glass used for the panel into a fixed position of the glass panel. In addition, it can be sealed and fixed to the inner surface 12a of the side wall of the glass panel.

The above-mentioned cathode ray tube has a predetermined panel pin,
That is, the glass wettability and the adhesiveness of the oxide film are improved, since the panel pin having high sealing property and effectively preventing the occurrence of glass cracks is used,
When fixing the shadow mask via the frame holder, and also when repeatedly subjected to temperature changes during use,
The sealing strength of the panel pin is kept extremely high, and the occurrence of glass cracks is prevented.
Therefore, it is possible to suppress the occurrence of electron beam mislanding due to insufficient fusion strength of panel pins, etc., which can improve the quality and manufacturing yield of cathode ray tubes such as color cathode ray tubes and increase the service life. Can be measured.

[0051]

EXAMPLES Next, specific examples of the present invention and evaluation results thereof will be shown. <Examples A1 to A3, Comparative Examples A1 to A2> As a constituent material of the panel pin, 18 wt% Cr-0.3 wt% Ti
A Fe-based alloy was used, which was subjected to barrel treatment, blast treatment and oxidation treatment shown in Table 1 below, and the length from the hem to the shoulder was 6 mm, the outer diameter was 13 mm, and the inner diameter was 11.2 m.
m panel pins were manufactured.

[Table 1]

The surface roughness of each panel pin produced above was measured according to JIS B0601-1994, and the waviness component (Wt) was determined from this. The surface roughness is measured by a surface roughness measuring device (“Form Talysurf S4C” manufactured by Taylor Hobson Co., Ltd.) with a stylus shape (60 ° C.).
It was determined by continuously measuring the outer surface of the panel pin linearly from the hem toward the shoulder using a diamond contactor having a conical radius of curvature (R) of 2 μm at the tip.

100 pieces of each of the above-mentioned panel pins were sealed on a glass panel for a cathode ray tube (glass composition: soft glass) by high frequency heating at 1200 ° C. for 45 seconds.

Then, this is heated from 30 ° C. to 500 ° C.
(The heating rate at this time is 200 ° C / hr) and then cooled to 30 ° C (the cooling rate at this time is 200 ° C / h)
The heat cycle test consisting of r) was performed for 10 cycles. After the test, the number of panel pins around which glass cracks were generated was examined to evaluate the glass crack prevention effect. The results are as shown in Table 2 below.

[Table 2]

From the above results, the panel pin according to the present invention does not cause glass cracks even if it is repeatedly heated and cooled.

<Examples B1 to B3, Comparative Examples B1 to B2>
As a constituent material of the panel pin, 18 wt% Cr-0.3
A weight% Ti-Fe alloy was used, which was subjected to barrel treatment, blast treatment and oxidation treatment shown in Table 3 below,
A panel pin having a length from the hem to the shoulder of 6 mm, an outer diameter of 13 mm and an inner diameter of 11.2 mm was manufactured.

[Table 3]

The surface roughness of each panel pin manufactured as described above was measured according to JIS B0601-1994, and the arithmetic mean roughness (Ra) and ten-point mean roughness (Rz) were determined from this. The surface roughness is measured by a surface roughness measuring instrument (“Form Talysurf S4C” manufactured by Taylor Hobson Co., Ltd.) and a stylus-shaped (60 ° conical tip radius of curvature (R) 2 μm) diamond contactor. Using, the outer surface of the panel pin was linearly measured continuously from the hem toward the shoulder.

With respect to each of the above panel pins, the adhesion to glass and the number of glass cracks generated were evaluated by the following methods. Adhesion to glass : The panel pin having the oxide film formed above was heated at a temperature of 1200 ° C. for 45 seconds with high frequency to seal a soft glass ring for a cathode ray tube having a diameter of 10 mm, a height of 8 mm and a thickness of 1 mm. Then, after cooling at room temperature for 5 minutes, a spherical iron weight with a weight of 0.5 kg was added to 10 cm.
The glass was broken by dropping it from the height of. By measuring the glass residual rate on the oxide film after the breakage, the adhesion between the panel pin and the glass was judged by the great evaluation shown in Table 4 below.

[Table 4]

Number of glass cracks : Measured by the same method as described above. The results are as shown in Table 5 below.

[Table 5]

From the above results, it is clear that the panel pin according to the present invention has a high adhesion strength between the oxide film and the glass, and that glass cracks do not occur even when repeatedly subjected to heating and cooling.

<Examples C1 to C6, Comparative Examples C1 to C5>
As a constituent material of the panel pin, 18 wt% Cr-0.3
A weight% Ti—Fe alloy material is used, and Ra shown in Table 6 is different by changing each condition of barrel treatment, blast treatment and oxidation treatment, and the length from the hem to the shoulder is 6
mm, an outer diameter of 13 mm, and an inner diameter of 11.2 mm were manufactured.

The oxide film adhesion, glass wettability, and sealing failure rate of each panel pin were evaluated by the following methods. Oxide film adhesion : After crushing the panel pin head to the shoulder with a compression press, rub the outside of the shoulder with a linen cloth and rub the inside of the pin neck in the same way to visually observe the degree of peeling of the oxide film. . In this case, ⊚: No peeling of the oxide film was observed. ◯: A part of the oxide film on the circumference (less than 30% in the circumferential direction) is peeled off to expose the bare metal. Δ: 30% or more and less than 60% of the oxide film on the circumference is peeled off to expose the bare metal. ×: 60% or more of the oxide film on the circumference is peeled off to expose the bare metal. And

Glass wettability : A plate having a length of 40 mm × width of 40 mm × thickness of 0.5 mm was obtained by using the above-mentioned panel pin constituent materials and performing barrel treatment, honing treatment and oxidation treatment under the same conditions as in the above-mentioned experimental example. Produce a sample.
Ten samples were prepared for each experimental example, and a cylindrical glass having an outer diameter of 8 mm, a thickness of 2 mm, and a height of 8 mm was placed on this sample, and heated at atmospheric temperature in a high-temperature electric furnace for 5 minutes at a sealing temperature of 1200 ° C. Then, the diameter (r) and the height (h) of the glass after heating are measured with a caliper. In this case, ⊚: The average r / h is 8 or more. ◯: The average r / h is 7 or more and less than 8. Δ: The average r / h is 6 or more and less than 7. X: The average of r / h is less than 6. And

Poor sealing rate : Panel pins were sealed to a 16-inch CRT panel glass at 1200 ° C. for 45 seconds and then annealed at 500 ° C. for 30 minutes to seal the glass after sealing. The crack occurrence rate was investigated. The results are as shown in Table 6 below.

[Table 6]

From the above results, the panel pin according to the present invention has good oxide film adhesion and glass wettability on both the outer surface and the inner surface of the panel pin, and has a low sealing failure rate.

[0066]

EFFECT OF THE INVENTION The panel pin according to the present invention has improved glass wettability and adhesion of an oxide film, has high sealing property, and effectively prevents the generation of glass cracks. From this, when fixing the shadow mask through the frame holder, and even when subjected to repeated temperature changes during use, the sealing strength of the panel pin was kept extremely high, and The occurrence has been prevented.

Therefore, according to the present invention, it is possible to fix a large and heavy shadow mask with high accuracy, with a small sealing position and sealing angle deviation of the panel pin,
It is possible to improve the quality and manufacturing yield of a cathode ray tube such as a color cathode ray tube, and to extend the service life.

[Brief description of drawings]

FIG. 1 is an external view showing a panel pin of the present invention.

FIG. 2 is a sectional view showing a panel pin of the present invention.

FIG. 3 is a cross-sectional view showing a cathode ray tube of the present invention and a conventional example.

FIG. 4 is an enlarged cross-sectional view showing the periphery of a mask frame fixed in FIG.

[Explanation of symbols]

1 panel pin 2 Holder support 3, 3 inside, 3 outside Sealing part 4 oxide film 11 cathode ray tube 12 Glass panel for cathode ray tube 18 shadow mask

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Rutanda             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office (72) Inventor Kiyoshi Nagasaki             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office (72) Inventor Matsunaga Mitsuhiro             8 East Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa             Shiba Electronics Engineering Co., Ltd. F term (reference) 5C031 BB03                 5C032 AA02 BB02

Claims (7)

[Claims] Claim: What is claimed is: 1. A panel pin for holding a shadow mask or an aperture grill, which is sealed to a panel for a cathode ray tube, wherein an oxide film is formed on at least the glass sealing part of the panel pin. A panel pin having a waviness component (Wt) of 10 μm or less in the surface roughness measurement. 2. A panel pin for holding a shadow mask or an aperture grill, which is sealed to a panel for a cathode ray tube, wherein an oxide film is formed on at least the glass sealing part of the panel pin. Has an arithmetic average roughness (Ra) of 0.1 to 3 μm in the surface roughness measurement.
and a ten-point average roughness (Rz) of 2 to 14 μm. 3. A panel pin for holding a shadow mask or an aperture grill, which is sealed to a panel for a cathode ray tube, wherein an oxide film is formed on at least the glass sealing part of the panel pin. Has an arithmetic average roughness (Ra) of 0.1 to 3 μm in the surface roughness measurement.
The panel pin is characterized in that the arithmetic mean roughness (outside Ra) of the outer surface of the sealing portion of the panel pin is larger than the arithmetic mean roughness (inside Ra) of the inner surface of the sealing portion of the panel pin. 4. The ratio (outside Ra) / (inside Ra) of the arithmetic average roughness (outside Ra) of the outer surface of the sealing portion of the panel pin and the arithmetic average roughness (inside Ra) of the inner surface of the sealing portion of the panel pin is set. , 1.1
The panel pin according to claim 3, characterized in that 5. A sealing alloy comprising 15 to 30% by weight of chromium, 0.01 to 1% by weight of aluminum, 0.1 to 1% by weight of silicon, 0.1 to 1% by weight of titanium, and the balance being substantially iron. The panel pin according to any one of claims 1 to 4, which is formed of 6. A glass panel for a cathode ray tube, wherein a sealing portion is fusion-welded to an inner surface of the panel of the cathode ray tube, and a holder supporting portion is joined to a peripheral portion of the shadow mask or aperture grill to form a shadow mask or aperture grill. A glass panel for a cathode ray tube, comprising a panel pin for fixing a peripheral portion to a predetermined position, wherein the panel pin is the one according to any one of claims 1 to 5. 7. A vacuum envelope having a panel, a phosphor layer provided on the inner surface of the panel, an electron gun arranged at a position facing the panel of the vacuum envelope, and the phosphor layer. The shadow mask or aperture grill disposed between the electron gun and the sealing portion is fused to the inner surface of the panel of the cathode ray tube, and the holder supporting portion is joined to the peripheral portion of the shadow mask or aperture grill. A cathode ray tube comprising a panel pin for fixing a peripheral portion of the shadow mask or the aperture grill to a predetermined position, wherein the panel pin is the one according to any one of claims 1 to 5.