JPS59171438A - Manufacture of reinforced cathode ray tube - Google Patents

Abstract

PURPOSE:To enhance exprosion and compression preventing effect by changing a tightening force of reinforcing member to the side wall of phase plate at the time of tightening the reinforcing member or during it is being tightened for the boundary of mold match line. CONSTITUTION:A tightening force of the first and second reinforcing members 9, 10 having the width a in the side of phase plate 1 from the mold match line 7 and a tightening force of the first and second reinforcing members 9, 10 having the width b in the side of sealing part 3 can be controlled in accordance with thickness of reinforcing members to be used. Therefore, an excellent reinforced cathode ray tube which is very stable after being cooled can be obtained by keeping a sliding force F2 in the side of phase plate from the mold match line 7 equal or lower than the sliding force F2' in the side of sealing part 3 from the mold match line 7 on the occasion of setting the reinforcing members.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a reinforced cathode ray tube.

[Technical background of the invention and its problems]

A cathode ray tube, for example, a color picture tube, has a face plate with a fluorescent screen adhered to its inner surface, a shadow mask disposed at a predetermined distance from the fluorescent screen, and 7
A face plate side wall portion integrally formed on the peripheral edge of the ace plate, a sealing surface of this face plate side wall portion, and a sealing surface of the large diameter portion are connected via frit glass to form a sealing portion and to the small diameter portion. It consists of a funnel to which the neck is welded, and a stem with an assembled electron gun disposed inside the neck, and a high vacuum is created inside the tube via an exhaust pipe provided in the stem.

For this reason, compressive strain occurs from the center of the face plate, which has a relatively smooth spherical surface, to the vicinity of the periphery, and tension type occurs to the side wall of the face plate, the sealing surface, and the vicinity of the large diameter part of the funnel, causing external force.

Implosion is likely to occur due to factors such as glass members.

For this reason, especially in cathode ray tubes such as large color picture tubes,
Explosion-proof treatment is often applied to the outer periphery of the side wall of the face plate to create a reinforced cathode ray tube.

This explosion-proof treatment can be roughly divided into the following types:

(1) Bond reinforced type: P, P, G (2) / Bond reinforced type: Kim cord, T-mend, shrink fit (3) Rim reinforced type:・・P-tube, shell bond 'Among these explosion-proof treatments, in the case of T-band, Kimcord, and shrink fitting, which are tightened using tension bands, apply heat to the front two long tension bands on the side wall of the face plate. A band heating method is used to fix both ends of the winding diameter, and a shrink fitting method is performed in which a tension band is previously formed to have a smaller diameter than the side wall portion of the face plate, and after heating, the side wall portion of the face plate is inserted and cooled. In this case, explosion-proof treatment is performed on the side wall of the face plate, including the mold match line provided on the side wall of the face plate. Strong tightening is advantageous in terms of explosion-proof reinforcement.

However, the area from the mold match line to the face plate generally has a three-dimensional complex shape, and the slope is usually large from the mold match line to the sealing surface, so the tension/ζ Tightening of the throat may occur when the force is biased from the mold match line to the face plate side, or when the tension band and the support fittings attached to this tension band (including these below) are tightened. This will cause the reinforcing member (reinforcing member) to shift toward the 7 ace plate.

Therefore, selecting the position and tightening of the reinforcing member and the distribution of force are important points in the manufacturing process of reinforced cathode ray tubes.

Conventionally, this displacement of the reinforcing member has been almost prevented by interposing an explosion-proof tape made of a mesh of glass fibers between the reinforcing member and the side wall of the face plate. However, this explosion-proof tape is expensive and has a limited ability to prevent displacement, which is a problem.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and has the following features: when tightening the reinforcing member at the mold mating line, or during tightening, the force when tightening the reinforcing member against the side wall of the face plate changes. It is an object of the present invention to provide a method for manufacturing a reinforced cathode ray tube that can improve the explosion-proofing effect.

[Summary of the invention]

The present invention provides a reinforced cathode ray tube in which a reinforcing member is tightened by a band method or a shrink-fitting method to include a mold match line provided on the face plate side wall portion of the cathode ray tube. In this manufacturing method, the tightening force of the reinforcing member's side wall of the face plate is equal to or less than the force on the face plate side with the middle mold match line as the border. This method of manufacturing a reinforced cathode ray tube is characterized in that it is carried out under the following conditions.

[Embodiments of the invention]

Next, an embodiment of the method for manufacturing a reinforced cathode ray tube according to the present invention will be described with reference to FIGS. 1 to 3. All of the figures show the reinforcing member in the tightened state or in the tightened state.

That is, a face plate with a fluorescent screen adhered to its inner surface) (1) This face plate) (1)
The face plate side wall portion (2
) and the sealing surface of the large diameter portion is sealed to the sealing surface of this face plate side wall portion (2) via the frit glass (3) to form a sealing portion (3), and the small diameter portion f-neck ( The cathode ray tube, which consists of a funnel (4) to which 5) is welded and an electron gun (6) disposed in the neck (5) and a stem (not shown), is sealed after evacuating the inside of the tube. Attach the support fittings (8) to include the mold match line (7).
a first reinforcing member consisting of a first tension (9) fixed in a desired position, and a second reinforcing member also comprising a hair-locking mat line (7) on this first reinforcing member (9); The member (II) is used to tighten it. In this case,
The angle (θ,) between the first reinforcing member (9) and the side wall portion (2,) on the face plate side bordering the mold match line (7) and the side wall portion (2,) on the sealing surface side. The angle formed (θ2
), there is a relationship θ, 〉Q, and both contraction forces (F
), (F'), one component force (F',) CF'1 is a tightening force, and the other component force (o't) O't') is a sliding force.

And between this sliding force (FtXF2'), F', >
If there is a relationship F,', the position of the reinforcing member f91H will change.

To explain this anti-slip method in terms of the shrink fitting method, as shown in Figure 3, tightening of the first and second reinforcing members f9) OI from the mold match line (7) to the face plate (1) @ (a). The attachment is the force and the width of the sealing part (3) side (
b) First and second reinforcing members f9) The tightening force of the OI can be controlled by the thickness of the reinforcing members used. For this reason, in this embodiment, the first and second auxiliary members t9)+1tll) are stacked on the face plate (1) side to increase the thickness of the cross section 'M. In other words, the tightening of part (a) is force ≦ (b To make the tightening of part 1 into force, σ: stress, W: holds true, but σ is a constant determined by the reinforcing member used, so (a) The tightening force for the part (b) can be controlled by the force, and the force for tightening the part (b) can be controlled by the cross-sectional area of the reinforcing member.

Therefore, when setting the reinforcing member, the mold match line (
By keeping the sliding force (F,) on the face plate side from 7) to the same level or less than the sliding force (7t') on the side of the sealing part (3) from the mold mating line (7), extremely good reinforcement can be achieved after cooling. You can get a shaped cathode ray tube.

However, in reality, various factors are considered and the contraction force (FXF')
It is necessary to control the value of

Next, a specific example will be explained with reference to FIG. However, mild steel is used as the reinforcing member, and σ = 30 kgF = F' = 480
I made it possible to obtain kfl.

To satisfy this condition, the width is 28mm and the thickness is 0.8t.
The first reinforcing member (9) of the mold match line (7)
A reinforcing member (9) with a width of 12 M'I is provided on the first reinforcing member (9).
! 107f from the mold line (7) on the second reinforcing member aO with a thickness of L 0.8t to the face plate (1) side
I was able to achieve this by making K appear.

According to this embodiment, it is not necessary to use a glass fiber mesh as in the conventional tape, and a tape made of inexpensive polyester film as the basic material can be used.

〔Effect of the invention〕

According to the present invention, the positional accuracy of the L-bar reinforcement member can be improved, and an inexpensive and high-quality reinforced cathode ray tube can be obtained without using an expensive explosion-proof tape for preventing slippage, so that it can be used industrially. It is highly effective.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing the manufacturing method of the reinforced cathode ray tube of the present invention. Figure 1 is a partially cutaway side view, and Figure 2 is a side view of the face plate side and the sealing area bordering the mold match line. An explanatory diagram showing the direction and size of the vesica to which the contraction force is applied. Figure 3 is an explanatory diagram showing how the tightening force changes depending on the cross-sectional area of the reinforcing member. Figure 4 is an illustration of the present invention. It is an explanatory view showing dimensions of each part of a specific example. 1...Face plate 2...Face plate side wall part 3...Sealing part 4...Funnel 5...
Neck 6...Electron gun 7...Mold match line 8...Supporting metal fittings 9...First reinforcing member 10...Second reinforcing member agent Patent attorney Inoue - Male Figure 1 No. 313!1 Fig. 2 Fig. 4 Agony

Claims (2)

[Claims] (1) A reinforced cathode ray tube is manufactured by tightening a reinforcing member to the side wall of the face plate of the cathode ray tube by band heating or shrink fitting to include the mold match line provided on the side wall of the face plate. In the manufacturing method, the reinforcing member is tightened with a force, the reinforcing member is tightened with a force, the reinforcing member is tightened with a force, or the reinforcing member is tightened with a moderate amount of force, and the face plate side is on the side of the sealing part with the mold match line being the approximate boundary. A method for manufacturing a reinforced cathode ray tube, characterized in that the manufacturing method is equivalent to or lower than that of the reinforced cathode ray tube. (2) The method for manufacturing a reinforced cathode ray tube according to claim 1, wherein the means for achieving the same or lower level is to increase the cross-sectional area of the reinforcing member.