JPS58155628A - Holding structure of shadow mask - Google Patents

Abstract

PURPOSE:To improve positional reproducibility and to obtain a color picture tube of good quality by a method wherein surface roughness of a surrounding wall and a panel pin of a spring material catching hole part is prescribed while applying carbon fine powder to the panel pin. CONSTITUTION:Basing on an idea that positional reproducibility of a shadow mark can be improved and landing due to impact can be reduced, by applying carbon fine powder together with, for instance, water glass to a panel pin even when surface roughness of the panel pin is fairly large, surface roughness Rmax of the panel pin is varied from 25mu to 23mu, carbon powder is applied and thereto surface roughness Rmax of the surrouding wall of a catching hole part is varied as 0.3mu, 0.5mu, 0.5mu in order to find distance between the shadow mask and the glass panel before and after formation of black stripes, so to say variation of (q) value thus to obtain a broken line graph 16, which shows landing variation represented by the broken line graphs 14, 15 and impact of 50G. In said broken line graphs, roughness of the panel pin is 10mu-20mu at Rmax while surface roughness of the surounding wall of the catching hole part is not more than 0.5mu at Rmax under the highest condition.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a support mechanism for a shadow mask, and specifically defines the surface roughness of a peripheral wall of a locking hole portion of a panel bin and a Slus Fring piece that fits into the panel bin. This invention relates to a shadow mask support mechanism that can reproduce an extremely high-quality I[IiI image within a panel glass.

[Technical background of the invention]

Color picture tubes are formed on the inner surface of the panel glass, and usually have a shadow mask that is placed opposite to the phosphor surface at a predetermined distance from a phosphor layer consisting of nine black stripes, a stripe-shaped phosphor layer that emits light in each color, red, and red. / A locking hole drilled near the free end of a spring piece of a shadow mask support structure fixed to a mask frame that supports a skirt portion of a Yado mask is implanted into the inner surface of a side wall of a panel glass.97
It is designed to fit into 8 Nelvin.

Here are two examples of such color picture tubes! This will be explained with reference to FIGS. 1 and 2.

That is, the one in Fig. 1 has fluorescent surfaces (2) K consisting of phosphor layers that emit light in red, edge, and blue colors adhered to the inner surface of the channel glass (1), which are arranged oppositely at a predetermined distance. The shadow mask (3) consists of a bimetallic (5) spring piece (6) fixed to a mask frame (4) that supports the skirt portion of this shadow mask (3). The circular locking holes (6 holes) drilled near the roadside are connected to the wall section (11) of the panel glass (1).
) is designed to fit into the panel bin (7)K installed on the inner surface of the panel bin (7)K. In the figure, the ) marks are welding points.

The one in Figure 2 is a shadow mask support structure in which a so-called lateral bimetal, in which two gold layers with different thermal tensile coefficients are welded in the width direction, is used as a spring piece (6). (6) Locking hole (
6a) is adapted to fit into the panel bin (7). Since the other parts are the same as those in FIG. 1, the explanation will be omitted.

The above-mentioned nine spring pieces (6), especially the fitting part between the locking hole (6m) and the panel bottle (7), are shown in Fig. 3, and the panel bottle (7) contains a small amount of additive elements. 18
*After processing Cr re into a predetermined layer, honing is performed to greatly increase the surface roughness, and then 1200
Oxidation treatment is performed in wet hydrogen at ℃, and finally Rmax
The surface roughness is 0.5 to 10 μm, and heat treatment is performed for convenient use.

Panel bottle (The reason why the surface roughness of the sword is set to this value is ξNelpin (7), M of the panel glass (1)
This is to widen the contact interface with the glass and improve the contact strength with the glass since 41 are provided on the wall portion (11).

On the other hand, the peripheral wall of the locking hole (61) of the snoring piece (6) is made to have an appropriate surface roughness in consideration of the economic efficiency of tampling.

[Problems with the back It4il technique] However, when the locking hole (6m) of the spring piece (6) is fitted with the P:Nelvin (force), the contact part (8)
Because of the large friction, when a light absorbing layer or a fluorocarbon layer is deposited on the inner surface of the panel glass (1), the position of the shadow mask (3) changes before and after installation, which worsens the so-called positional dust resistance. . As a result, as a color picture tube, there was a problem in that it became one of the causes of slanting of the electron beam and lowered the white uniformity (WU). This was done in consideration of the
By regulating the surface roughness of the peripheral wall of the locking hole portion of the spring material and the panel bin, and by coating the panel bin with fine carbon powder, the re-agglomeration property is improved and the color picture tube is of good quality. The object of the present invention is to provide a support mechanism for a shadow mask that can be over-the-counter.

[Summary of the invention]

That is, in the present invention, the mask frame supporting the shadow mass is attached to a plurality of penel bins embedded in the inner surface of the channel glass by fitting the locking holes near the end of the nine spring pieces. In the shadow mask support 81 willow, the surface roughness Rmax of the nelpin is set to 10 to 2.
0#, the surface roughness Rmax of the peripheral wall of the locking hole is 0.5 or less, and fine carbon powder is deposited on the surface of the panel 270.

[Embodiments of the invention]

The inventors conducted a series of experiments using a 26 inch ioo' deflection color picture tube.

First, the surface roughness of the panel bin is set to Rmax of 23μ and 18μ.
.

12μ, 7μ, 2.5μ, and the surface roughness of the peripheral wall of the locking hole Rmax was 0.7μ, 0.5μ, 0.3
For example, when changing μ, the distance between the shadow mask of the Puftsk stripe formation precursor and the glass panel, so-called q
When the change in value was calculated, the bend in Figure 4 was found.
lU4 was obtained. Judging from this result, the smaller the surface roughness of both the panel bin and the surrounding wall of the locking hole, the
It can be seen that Or disease is caused by reducing the change in q im before and after forming a plate layer of light absorption) on the inner surface of the Nominelle glass.

Next, in Fig. 4, the maximum and minimum q values are shown: the surface roughness of the nelpin is Rmax of 23μ, and the surface roughness of the storm wall at the retaining hole is nmax of 0.7μ. A color picture tube assembled by using one color picture tube, one with a coating thickness Rmax of 2.5μ, and one with a surface roughness Rmax of 0.3μ of the peripheral wall of the locking hole. As a result of using 50 color picture tubes and assembling them, we actually determined the variation in electron beam landing using Kl#111.
What was 30.5μ for the first party was 21.0μ for the latter.
It's great that it decreases by about 1/3.

In this way, by reducing the surface roughness of the panel pin, which is the support center of the shadow mask support structure, and the wall of the locking hole sm, the position reproducibility of the shadow mask is improved, and the electron beam when used as a color receiver tube is improved. However, when we conducted various tests using a collar receiver made from a combination of a panel pin with a small surface roughness and a peripheral wall of the retaining hole, we found that It was found that the drop test, that is, the impact*, increased the landing change. That is, there is a phenomenon in which the amount of change increases from about 50 tones in the conventional shock of 50G to about 60μ in the above-mentioned combination. The reason for this is thought to be that when the surface roughness is small, the rotation of the comrades becomes better during the chain attachment, causing slight deformation in the spring pieces, etc.

As a result of extensive research, Inventor and Co., Ltd. have found that if fine carbon powder is applied to Banelvin in advance along with water glass, etc., even if the surface roughness of Nelpin is considerably large, it becomes a shadow mask. Based on the idea that the position repeatability of the panel pins can be improved and the landing caused by impact can be reduced, the surface roughness of the panel pins [from 25 to 23 pitches in Rmax] has been improved.
Apply fine carbon powder to the surface of the peripheral wall of the locking hole.
, α5μ, and the change in q value before and after the formation of black stripes was calculated using the line graph I (19 and 50) shown in Figure 5.
Find the landing change due to G impact and obtain the line graph 4 according to Figure 5.

What can be obtained from the erosion graphs a□41- and (II) is that when the surface roughness of the peripheral wall of the locking hole is 0.3μ and 0.5μ, the amount of change in q value when forming black stripes is J
The surface roughness of Nelvin gradually increases when Rmax is 18β or more. In this case, with Rmmx, up to 20 voices can be used satisfactorily, but with 0.7 μ, the amount of change will suddenly increase at 18 voices or more, and with 20 μ, it will be out of specification, and with 5
The amount of landing change due to 0G impact test was 0.3μ,
Both 0.5μ and 0.7μ are 7.Nelvin surface roughness is 12.
It increases from the vicinity of the voice, but it is within the standard at 10β.

In other words, the surface roughness of the panel pin is Rmax 104 to 20.
μ, the surface roughness of the peripheral wall of the locking hole Rmax is 0.5 tones or less, which is the optimum condition.

〔Effect of the invention〕

As mentioned above, the surface roughness of the panel pin O is 8μmax and 10
By setting the surface roughness of the circumference of the locking hole to 0.5 or less at Rmax and applying fine carbon powder to the panel pin, the change in the 9 value is small, and the change in mislanding is reduced. In particular, it is important to obtain a high-quality color-receiving tube with little negative zero test value mislanding change.
@tonatsuku.

[Brief explanation of drawings]

Figures 1 and 2 have different shadows! Fig. 3 is a cross-sectional view of the main part of the collar tube having a sufu support structure, Fig. 3 is a cross-sectional view of the main part showing the relationship between the locking hole of the spring piece and the channel nelvin, and Fig. 4 is the surface roughness of the /senel pin. A line diagram showing the relationship between the surface roughness of the locking hole and the change in q value. Figure 5 shows the surface roughness of the panel pin and the surface of the peripheral wall of the locking hole when an image layer of fine carbon powder is formed on the panel pin. A line diagram showing roughness and changes in q value before and after the formation of black stripes.
FIG. 3 is a line diagram showing the surface roughness of the groove, the surface roughness of the peripheral wall of the locking hole portion, and the landing change due to a negative zero of 50G. 1...Crow/Nananel 2...Fluorescent surface 3...
Shadow mask 4... Mask frame 5... Bimetal 6... Spring piece 6m... Locking hole portion 7... Panel pin agent Patent attorney I
Top - Male Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) /#Shadow master *support fhqxlyv − in multiple panel bins that can be planted in the flannel glass 11
In the shadow mask support mechanism, the surface roughness Bmax of the panel pin O is set to 10 to 2.
0s1 Locking hole O peripheral wall 011 - Roughness Rmax is set to 0.5 tones or less, and fine carbon powder is deposited on the Senel pin 011 surface.A support mechanism for a shadow mask. (2) Formation of fine carbon powder is the carbon O mold retention mechanism.