JPS6359174A - Color picture tube - Google Patents

Abstract

PURPOSE:To improve a removing operation characteristic by providing flower type holes in the adjusting parts of respective holders used for fitting with a stud pin and making the spring pressure of one of them 70-90 % of other holders. CONSTITUTION:On the center part of the adjusting part 4, the flower type hole 6 for fitting the stud pin is provided and the spring pressure produced at the time of fitting the stud pin in the holder is set to 70-90 % by the adjustment of the thickness of the plate of a free part 3 or the width C. Namely, the thickness of the plate of the holder free part 3 only of only one of the flower type holes disposed on the four holders is thinned to 0.3 mm from the conventional 0.4 mm-0.5 mm and a method for having substantially the same width C as the adjusting part 4 is used. When the spring pressure of the one holder is lowered below 70 % than that of the other holders, a beam position is deviated by more than 50 mum than an initial value and if it is a value exceeding 90 %, the spring pressure has little difference from the spring pressure in other flower type hole and an effect does not appear, so that the spring pressure is specified to be 70-90 %.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a color picture tube in which a shadow mask is suspended on a panel portion using a corner support method.

(Prior art) A color picture tube uses a vacuum container in which a glass panel part, a funnel part, and a neck part are continuously integrated.
It is constructed by installing various parts inside this container.

A conductive thin film is coated on the inner surface of the funnel, and the metal parts that come into contact with this are exposed on the outer surface of the funnel to function as an anode, and together with the cathode located at the end of the electron gun structure located in the neck, form an electric circuit. make it work. Electrons emitted from the cathode reach the phosphor layer deposited on the inside of the substantially flat surface of the panel section. For this purpose, a shadow mask is disposed close to and opposite to the phosphor layer, and a rectangular frame supporting it is attached around the shadow mask. This mask may be of a so-called in-line type in which strip-shaped slits are formed regularly.

On the other hand, a skirt part is formed continuously and integrally at the end of the flat surface of the panel part in a direction bent by 90 degrees, and this is used to fix the rectangular frame.

Hang the shadow mask on the panel. The specific method will be explained with reference to FIGS. 2 to 5.

As shown in FIG. 2, a skirt portion 21 is continuously and integrally formed at the end of the panel portion 20, and stud pins 22 are formed at the knees. Further, as shown in FIG. 3, each corner of the rectangular frame 24 fixed around the shadow mask 23 has a flat portion (not shown) in a direction perpendicular to the diagonal axis.
A holder 25 and a coin 26 shown in Figure 4 A9 are welded to this N using a jig, and a stud pin 2 is attached to this N.
0... to suspend the shadow mask 23 on the panel 20. This holder 25 is made of resilient stainless steel and has a main part 27 with a bent piece at the end, as shown in the perspective view of FIG. 4 and the cross-sectional view of the opening in FIG. It is composed of a free part 28 arranged slightly apart, and an adjusting part 30 overlaid thereon and having a Hanafuda 29 in the center.

The plate thickness of this free part is usually about 0.4 to 0.5 mm, and the shadow mask 23 is suspended on the panel 20 by fitting stud pins 22 into the Hanafuda 29. The diameter of one of these four holders is made larger than the diameter of the stud pin 22, as shown in FIG. 4(b).

When fixing the holder 25 to the rectangular frame 24 surrounding the shadow mask 23, the flat part and the main part 27 of the holder 25 are welded together using a jig (not shown), and then the stud pin 22 is fixed. into the Hanafuda 29.

A coin 26 shown in the opening of FIG. 4 is used in this assembly process. This is made of stainless steel and molded into a rectangular parallelepiped like the holder 25, with a through hole 3 in the center corresponding to the diameter of the stud pin 22.
1. To use this, use a jig to weld the holder 25 to each corner of the frame 24, and weld the coin 26 to the adjustment part 30 where the large-diameter Hanafuda 29 is provided.
Fit the stud pins 22 into each Hanafuda card 29 and the coin through hole 31, and attach the shadow mask 23 to the panel 2.
Suspend at 0. During assembly, the vertical relationship is adjusted using the spring of the coin 31, and the frame and holder A' 5S
It plays a role in adjusting ly errors and irregularities in stud pin spacing.

(Problems to be Solved by the Invention) Figure 5 (A) 1 and Figure 6 (B) 2 are cross-sectional views of holders with or without coins, and also show the change in shape when both holders are squeezed. In this sectional view and FIG. 4, the main portion 27 is indicated by a.

The free part is indicated by b, and the distance between a and b is maintained at about 9 degrees. When both types of holders are squeezed, the holder with the coin has a smaller squeeze amount, so the coin warps, creating a gap and making contact with the stud pin.

Therefore, if a coin is used, an accident may occur in which the coin comes into contact with or gets caught on a stud pin during manual or automatic removal of the panel and frame, resulting in impossible removal or deformation of the shadow mask, frame, etc.

An object of the present invention is to provide a new color picture tube that eliminates the above-mentioned drawbacks.

[Structure of the invention]

(Means for Solving the Problem) For this reason, in the present invention, a hanafuda is provided in the adjustment part of each holder used for fitting with a stud pin, and the spring pressure of one of the holders is set to 70% of that of the other holders. A method of setting the ratio to 90% was adopted.

(Function) As mentioned above, in a color picture tube, when the frame is suspended from the panel section, the elastic force of the holder fixed to the frame is used to alleviate the impact on the shadow mask.

One of the test items for this color picture tube is a drop characteristics test. Specifically, a packaging box containing a color picture tube is pulled up with a pulley and then dropped at 30G, and the beam position of this color picture tube is determined from the In1tial value. Items with a deviation of 50 IJm or more are rejected as defective items.

By the way, in the color picture tube according to the present invention, the above-mentioned method is adopted, and the basis thereof is this drop characteristic test. That is, the spring pressure of one holder is 7
If it is lower than 0%, the beam position will deviate from the In1tial value by more than SO, =, and if it is set to a value exceeding 90%, there will be no significant difference from the spring pressure in other Hanafuda and no effect will be seen, so it is specified as 70% to 90%. It is something to do.

(Example) The present invention will be described in detail with reference to FIGS. 1(a) and 1(b), but for convenience, reference will also be made to the description of the prior art and the drawings.

Even in the color picture tube according to the present invention, it is conventional to suspend the shadow mask on the panel by fitting stud pins into holders attached to the diagonal ends of the frame, but as mentioned above, consideration has been given to the holders. is added.

As shown in FIG. 1, it consists of a main part 2 forming a bent piece 1 at the end, a free part 3 fixed to the main part while maintaining a distance of about 9IlI11, and an adjustment part 4 provided overlapping this part. Prepare the holders for each other. A hanafuda 6 into which a stud pin is fitted is provided in the center of the adjustment part 4, and the spring pressure generated when the stud pin is fitted in this holder can be reduced by 70% to 90% by adjusting the plate thickness or width C of the free part 3. %. That is, the plate thickness of the holder free part 3 of only one of the four Hanafuda cards 6 provided on the four holders was conventionally 0.4 mm to 0.5 mm.
A method is adopted in which the thickness of the width C is reduced to 0.3 mm, and the width C is approximately the same as that of the adjustment portion 4.

Further, although an example in which stainless steel is used as the material has been described, it is of course possible to select an appropriate material.

The giant holder formed in this way is welded to each corner of the rectangular frame using a jig as in the conventional technique.
Stud pins formed on the skirt portion of the panel are fitted into the hanafuda of this holder to suspend the shadow mask on the panel. The stud pin, the skirt portion, and the shadow mask are completely the same as those described in FIG. 2, so the details will be omitted.

〔Effect of the invention〕

As described above, in the color picture tube according to the present invention, even though a coinless holder is used, it can achieve the same function as when using a coin, improve the workability of attaching and detaching, and enable the introduction of an automatic detaching device. Become. Further, even after the drop test, the deviation of the electron beam can be maintained at 50 μm or less from the In1tial value, so there is no problem with the color picture tube characteristics.

[Brief explanation of the drawing]

Figure 1A1 is a perspective view of the holder applied to the present invention, Figure 2 is a sectional view showing the relationship between the conventional stud pin and holder, Figure 3 is a sectional view showing the suspended state of the frame and panel, and Figure 4 is a sectional view showing the relationship between the conventional stud pin and the holder. Figure A 2 is a perspective view showing a conventional holder, and Figure 5 A 2 is a sectional view of a conventional coinless holder and a coin-equipped holder. Agent Patent Attorney Mr. Inoue Figure 1 $ 2 1, 23 Figure 3 Figure 4 1 Figure 6

Claims (1)

[Claims] A panel portion having a substantially flat surface, a skirt portion integrally formed continuously with the panel portion, a neck portion continuous and integrally formed with the skirt portion, and an electron gun portion disposed on the neck portion; A phosphor layer provided on the inner surface of the flat surface of the panel, a shadow mask disposed close to and opposite to the phosphor layer, a rectangular frame attached to and supporting the shadow mask, and each of the frames. A metal holder fixed to a corner, a hole formed in the holder, and a stand pin provided in the skirt portion corresponding to the hole,
A color picture tube characterized in that one of the spring pressures generated in the four holders by the stand pin detachably fitted into the hole is 70 to 90% of the other spring pressure.