JPS624998Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a cathode ray tube, and more particularly to a sealing device for an ultra-small cathode ray tube.

The sealing operation of a cathode ray tube will be explained with reference to the drawings shown in FIGS. 1 to 3. In the figure, reference numeral 1 denotes a stem comprising an exhaust thin tube 2, an internal lead wire 3a, and an external lead wire 3b, and each of the electron guns 6 has a plurality of cylindrical electrodes 4 coaxially arranged and fixed with a glass insulating material 5. A mount A is constructed by welding and fixing the electrode 4 and the internal lead wire 3a of the stem 1 through lead wires 7, respectively. Reference numeral 8 indicates a getter assembly provided at the tip of the electron gun 6, and reference numeral 9 indicates a support spring for supporting the electron gun 6 within the net and for supplying voltage to the high voltage electrode of the electron gun. 10 is a bulb consisting of a face portion 10a, a funnel 10b, and a neck portion 10c, and a phosphor 11 is provided on the inner surface of the face portion 10a.
A metal back layer 12 is formed on the funnel part 1.
A graphite layer 13 is formed on the inner surface of 0b. 10
d indicates a flared portion that opens to a large diameter and is provided at the open end of the neck portion 10c. Further, 14 is a valve holder that supports the valve, 15 is a valve guide rail that moves the valve holder 14 in the direction of the arrow shown in the figure;
Reference numeral 6 denotes a mount pin having an upwardly opening insertion hole through which the exhaust thin tube 2 and the external lead wire 3b are inserted and supported;
Support mount A. 17 is the mount pin 16
The mount pin guide rail moves the mount pin in the direction of the arrow shown in the figure, and 18 indicates a sealing burner.

Sealing is performed as follows. That is, the valve holder 14 and the mount pin 16 move synchronously, and the valve holder 14 moves in synchronization with the valve guide rail 1.
Mount pin 16 moves horizontally on 5.
rises on the mount pin guide rail 17,
Insert the mount A into the neck portion 10c of the valve 10 until it reaches the normal position. Then, it moves a certain distance in parallel to the valve guide rail 15, and during that time, the burner 18 heats the area around the neck portion 10c from the outside to fuse and seal the stem 1 and the neck portion 10c.

In this case, the flare portion 1 is located at the open end of the neck portion 10c.
0d, the tip of the support spring 9 can be easily guided into the neck portion 10c, and the mount A can be inserted into the neck portion 10c.

On the other hand, before the sealing operation, aluminum is deposited inside the bulb 10 separately from the sealing operation, and a metal back layer 12 and a graphite layer 13 are formed. However, the metal back layer 12 is formed by installing a vapor deposition heater 19 with an aluminum piece attached inside the bulb 10 as shown in FIG. , surrounding the neck portion 10c, an envelope 21
The inside of the valve is evacuated by a vacuum pump 22 connected to the vacuum pump 22, and electricity is supplied to the vapor deposition heater 19 to evaporate the aluminum pieces and perform vapor deposition. Here, the rubber pad 20 is placed in contact with the conical portion of the funnel portion 10b so that sufficient adhesion can be obtained even with variations in the dimensions of the bulb.

However, in ultra-small cathode ray tubes, especially those with rectangular screens, the diameter of the conical portion of the funnel is small. Since the diameter of the neck part is approximately 20 mm, there was a problem that if the flare part 10d was provided at the neck part, the rubber pad would not come into close contact with the surface, and the exhaust for vapor deposition would be incomplete. Therefore, if you try to insert the mount into a neck part that does not have a flare part, the support spring at the tip of the electron gun tends to get caught on the open end of the neck part, making insertion difficult. Installation required additional work, which led to a decline in index performance and increased costs. Also, when inserting the mount into the neck part, it is possible to think of a device that presses the support spring so that it is positioned inside the neck inner diameter to facilitate insertion.
If the sealing burner is fixed and the valve and mount are rotated and inserted in order to heat the circumferential surface of the neck, it becomes mechanically complex, and the equipment is required only for ultra-small cathode ray tubes, so it requires a large amount of equipment. The problem was that it led to a significant increase in costs.

This invention was proposed in view of the above problems.
To provide a device capable of surely inserting a mount into a valve without a flare while minimizing changes to existing equipment.

A specific embodiment of the present invention will be explained with reference to FIGS. 5 to 10. In the drawings, the same reference numerals as those shown in FIGS. 1 to 4 indicate the same components. In the figure, 2
Reference numeral 3 denotes a chuck mechanism located above the mount pin 16, which moves up and down and grips and releases the guide ring 24. The guide ring 24 has a through hole 25 having approximately the same diameter as the inner diameter of the neck portion, and is provided at one open end with a tapered portion 25a that widens in diameter toward the open end. Further, the guide ring 24 can be freely inserted through the mount pin 16, surrounds the mount pin 16, and falls downward.

This operation will be explained below. That is, the chuck mechanism 23 holding the guide ring 24 is lowered from above the mount A attached to the mount pin 16 with the tapered part 25a facing downward, and the support spring 9 at the tip of the mount A is lowered as shown in FIG. The chuck mechanism 23 is opened by inserting the guide ring 24 into the part.

Since the diameter of the through hole 25 of the guide ring 24 is approximately the same as the inner diameter of the neck portion, the support spring 9 supports the guide ring 24 with spring pressure in approximately the same state as when inserted into the neck portion. Therefore, since the diameter of the tip of the support spring 9 is reduced inward, the mount pin 16 rises and the neck 10 is moved upward as shown in FIG.
When inserting the mount A into the neck part 10c, the support spring 9 is guided from the through hole 25 of the guide ring to the neck part 10c even if the neck part 10c is not flared.
Insertion is extremely easy. Further, since the guide ring 24 can be inserted while surrounding the mount pin 16, when the support spring 9 is inserted into the neck portion 10c and the mount A is guided into the neck portion 10c, the guide ring 24 is inserted into the neck portion 10c. The guide ring 24 is pushed down by the mount pin 16 and cannot be supported by anything other than the support spring 9.
falls below. Therefore, the sealing operation is performed by the burner 18, and the excess portion (cullet) of the neck portion 10c also falls below the mount pin 16, making it possible to easily remove the cullet. After the sealing work is completed, the guide ring 24 is gripped by the chuck mechanism 23 and removed from the mount pin 16 for repeated use.

Further, a second embodiment will be explained with reference to FIGS. 9 to 11. In the figure, 16'a is the mount pin 1
6', one end of the leaf spring 26 is fixed outside the side wall window 16'a of the mount pin 16' so that the guide ring can be inserted therethrough, and the other end is fixed to the side wall window 16'a of the mount pin 16'. Bend it inward and attach the exhaust thin tube 2 inserted into the mount pin 16' to the leaf spring 2.
6 to prevent mount A from coming off. Further, as shown in FIG. 10, 27 is a guide ring having a through hole 28 having a diameter approximately equal to the inner diameter of the neck portion, and is inserted into a guide pin 16' having a diameter slightly smaller than this and positioned at the lower end. 29 is guide ring 2
This is a chuck mechanism that grips the holder 7 and moves it up and down. FIG. 11 shows a sectional view taken along line BB in FIG. 9.

These operations will be explained below. That is, when the mount A is inserted into the mount pin 16' and supported, the exhaust thin tube 2 is fixed by the leaf spring 26, and the mount A is
is prevented from coming off from the mount pin 16'. Next, the chuck mechanism 29 grasps the guide ring 27 and moves upward to place the guide ring 2 at the support spring 9 position.
Release 7 and descend. The guide ring 27 is held by the support spring section by the spring pressure of the support spring 9.
Therefore, the guide ring 27 and the neck portion 10c are the eighth
As shown in the figure, the support spring 9 is connected coaxially and can be easily guided into the neck, and at the same time the guide ring 27
is pressed down by the neck and mount pin 1
Since it falls below 6', it does not interfere with sealing and the sealing work can be easily performed.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the chuck mechanism may be omitted by supporting a mount pin with a guide ring attached to the support spring portion of the mount. Furthermore, the present invention can be applied not only to ultra-small cathode ray tubes, but also to cases in which the stem is positioned at the open end of the neck portion without providing a flare portion at the open end of the neck portion, and the stem and the neck portion are fused and sealed. Further, the tapered portions of the guide ring may be provided at both opening ends of the through hole.

As described above, according to the present invention, the electron gun can be easily guided into the neck even in cases where the neck cannot be provided with a flared part, such as in an ultra-compact cathode ray tube. It is possible to prevent jamming, reduce work time and reduce the defective rate due to insertion errors without requiring large-scale equipment.

[Brief explanation of the drawing]

Figure 1 is a side view of the cathode ray tube mount;
The figure is a side sectional view of the valve, FIG. 3 is a side view explaining the sealing operation, FIG. 4 is a side sectional view explaining the metal pack vapor deposition method, and FIGS. 5 to 8 are one embodiment of the present invention. FIG. 5 is a side view of a device for attaching a guide ring to a mount attached to a mount pin, FIG. 6 is a sectional view of the guide ring used in the device shown in FIG. 5, and FIG. FIG. 8 is a side sectional view of the guide ring attached to the support spring; FIG. 8 is a side sectional view illustrating how the mount is inserted into the neck; FIGS. 9 to 11 illustrate other embodiments of the present invention. 9 is a side view of a device for attaching a guide ring to a mount attached to a mount pin, FIG. 10 is a side sectional view of a guide ring used in the device shown in FIG. 9, and FIG. 11 is a side view of a device for mounting a guide ring on a mount attached to a mount pin. shows a BB sectional view in FIG. 1... Stem, 6... Electron gun, 9... Support spring, 10c... Neck section, 16, 16'... Mount pin, 24, 27... Guide ring, A...
mount.

Claims (1)

[Scope of utility model registration request] A mount pin is provided to upright support a stem to which an electron gun is fixed and has a support spring at its tip, and is movable up and down.In order to guide the electron gun supported by the mount pin into the valve neck, the support spring is inserted into the inner diameter of the neck. A cathode ray tube seal comprising a guide ring which is reduced in diameter to approximately the same diameter as the mount pin, and which surrounds a mount pin and causes it to fall downward when an electron gun is inserted into the neck part. Stop device.