JP2003016936A - Manufacturing device and manufacturing method for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing device for a cathode-ray tube capable of preventing deposition of falling frit to a neck part and intrusion of dust from an opening part of the neck part with simple constitution. SOLUTION: A panel 1 and a funnel 2 with an opening at the end of a neck part 2a, are formed into a sealed bulb sealed with frit glass 15 by a sealing frame 10 in a sealing furnace where hot air is circulated by a circulating fan in the furnace. In this case, the panel 1 and the funnel 2 are supported in joint arrangement, placing the funnel 2 side on the lower side, and the falling frit falling from the outer periphery of the funnel 2 is accumulated by a cap 30 supported by a cap adjusting mechanism 20 to adjust an opening end 2b of the neck part 2a while changing the direction of hot air flowing toward the opening end 2b of the neck part 2a by the circulating fan in the furnace.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an apparatus and a method for manufacturing a cathode ray tube.

[0002]

2. Description of the Related Art Generally, in a method of manufacturing a cathode ray tube,
The process of passing through the sealing furnace and joining the panel and the funnel with frit glass is adopted. For bonding in this case, the frit glass is heated to about 400 degrees Celsius to be crystallized. In addition, the frame that supports the funnel is used to align the panel and the funnel. Then, the whole frame is placed on a metal mesh belt and passed through the sealing furnace to carry out a large amount of joining process.

As a result, since both the mesh belt and the frame stand are repeatedly passed through the high-temperature sealing furnace, iron oxide (rust) is generated.
Is generated. Also, a large amount of metal powder is generated due to friction with the metal drum portion of the power mechanism for passing the mesh belt through the furnace.

Due to the structure of the cave-shaped sealing furnace, such a large amount of rust and metal powder enter the atmosphere from the outside of the furnace and are convected into the furnace by the hot air flowing in the sealing furnace. . In this state, the neck of the funnel with an open mouth before insertion of the electron gun is passed.

Therefore, in the conventional cathode ray tube manufacturing process, in order to prevent dust (rust or metal powder) in the sealing furnace from being sucked into the sealing valve formed of the panel and the funnel, the neck portion of the funnel is A mesh mesh plug is brought into contact with. Further, since the dust inside the valve also has a generation source in various parts inside the valve, it is also practiced to dump the dust collectively by ultrasonic vibration or hitting the valve.

[0006]

As described above, the dust sucked into the sealing valve or the dust generated in the sealing valve is caught and left on the pipe internal parts inside the sealing valve. The residual dust causes various inconveniences such as deterioration of withstand voltage characteristics, sparking, and clogging of the shadow mask.

[0007] In order to eliminate such inconvenience, if a dust countermeasure is taken by changing the structure of the sealing furnace, it is necessary to reconstruct the sealing furnace, which leads to an increase in equipment cost, and also technically. With difficulty. Further, since the dust once sucked into the valve when passing through the sealing furnace is caught on the pipe internal parts and remains, it is difficult to completely remove it only by tapping the valve after sealing.

Further, recently, it has become mainstream to use a funnel having a flared neck portion, and a mesh frit and an opening end portion of the neck portion are welded together by a frit falling off the flared neck portion. State,
This will cause the neck to crack.

The present invention has been made in view of the above problems, and can prevent the falling frit from adhering to the neck portion without increasing equipment cost and manufacturing cost with a simple structure and process. At the same time, the present invention provides a cathode ray tube manufacturing apparatus and manufacturing method capable of preventing dust from entering through the opening of the neck portion.

[0010]

According to a first aspect of the present invention, there is provided a cathode ray tube manufacturing apparatus, wherein a panel and a neck portion are sealed in a sealing furnace by a sealing agent to form a sealing valve and an end portion of a neck portion. A valve support mechanism for supporting the funnel having an opening in a joint arrangement, and a neck portion side that covers the opening end portion of the neck portion and its periphery from below and is opened with a gap from the opening end portion. And a dish-shaped cap body that is supported by the valve support mechanism so that the position of the sealing valve can be adjusted in the tube axis direction, and that supports the outer bottom portion of the cap body, and the cap body and the opening end of the neck portion. And a cap body adjusting mechanism capable of adjusting the gap.

According to a second aspect of the present invention, in the apparatus for manufacturing a cathode ray tube, an end of a panel and a neck portion which are sealed by frit glass to form a sealing valve in a sealing furnace in which hot air is circulated by a circulating fan in a furnace. Funnel with an opening in the section,
A valve support mechanism that supports this funnel side downward in a joint arrangement, and a neck portion that is open, is formed in a dish shape so as to cover the opening end portion of the neck portion and its periphery from below, and the opening end portion. Is placed with a gap in between,
A cap body that accumulates the falling frit that falls from the outer periphery of the funnel and that changes the wind direction of the hot air toward the opening end of the neck portion by the in-furnace circulation fan, and the valve support mechanism in the axial direction of the sealing valve. A cap body adjusting mechanism that is supported so that its position can be adjusted, supports an outer bottom portion of the cap body, and can adjust a gap between the cap body and the opening end of the neck portion. Is.

According to a third aspect of the present invention, in the apparatus for manufacturing a cathode ray tube according to the first or second aspect, the cap body adjusting mechanism has a joining plate provided on a top portion of the cap plate and a bottom portion of the cap body. It is characterized in that the cap body is detachably supported by joining and holding by a clip.

The invention according to claim 4 is the invention according to claim 2 or claim 3.
In the apparatus for manufacturing a cathode ray tube as described above, the cap body is formed in a concave shape in which the lower part of the tube axis is farthest from the opening end portion of the neck portion, accumulates the falling frit, and presents a convex surface on the outer surface side of the neck portion opening. It is characterized in that the direction of hot air by the in-furnace circulation fan toward the end is changed.

According to the apparatus for manufacturing a cathode ray tube of the present invention, when the panel and the funnel are sealed by the frit glass as the sealing agent, the cap body is arranged at the opening end of the neck portion with a gap. By this, the falling frit falling from the outer periphery of the funnel can be accumulated without adhering to the neck part to avoid the neck part cracking, and the direction of the hot air containing dust toward the opening end part of the neck part by the circulating fan in the furnace It can be changed to prevent dust from entering through the opening of the neck portion and eliminate characteristic deterioration.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a cathode ray tube, wherein a panel and a funnel having an opening at an end of a neck portion are supported in a bonding arrangement in a sealing furnace and sealed with a sealing agent. The outer circumference of the neck part is formed by a dish-shaped cap body that is opened on the neck part side so as to cover the opening end part of the neck part and its periphery from below and with a gap from the opening end part. And a step of collecting the drop-off sealing agent that drops off from the vicinity without contacting the open end of the neck part.

According to a sixth aspect of the present invention, in the method of manufacturing a cathode ray tube, the panel and the funnel having an opening at the end of the neck portion are provided on the funnel side in a sealing furnace in which hot air is circulated by a circulating fan in the furnace. Supported in a bonding arrangement with the lower side as a lower side, and a step of sealing with a frit glass, the neck side is opened, and is formed in a dish shape so as to cover the opening end of the neck section and its periphery from below, and, With a dish-shaped cap that allows the gap between the neck and the open end to be adjusted,
While accumulating the falling frit that falls from the vicinity of the outer periphery of the neck without contacting the open end of the neck,
And a step of changing the wind direction of the hot air toward the open end of the neck portion by the in-furnace circulation fan by the outer surface of the dish-shaped cap body.

According to a seventh aspect of the present invention, in the method of manufacturing a cathode ray tube according to the fifth or sixth aspect, the dish-shaped cap body adjusts a gap between the dish-shaped cap body and the opening end of the neck portion. It is characterized in that it is detachably supported by the top of the cap body adjusting mechanism.

According to an eighth aspect of the present invention, in the method of manufacturing a cathode ray tube according to the sixth or seventh aspect, the cap body is formed into a concave surface shape in which a lower portion of the tube axis is farthest from the opening end portion of the neck portion, and the cap frit is dropped. Is accommodated, and the direction of hot air by the in-furnace circulation fan toward the open end of the neck is changed on the outer surface side having a convex surface.

According to the method of manufacturing a cathode ray tube of the present invention, the falling frit can be prevented from adhering to the neck portion by a simple process without increasing the manufacturing cost, and dust can enter from the opening portion of the neck portion. It is possible to prevent the occurrence of cracks in the neck portion, to prevent dust from entering the tube, and to prevent deterioration of the characteristics of the cathode ray tube.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

FIG. 1 is a schematic configuration diagram showing a manufacturing apparatus of a cathode ray tube for joining and sealing a panel 1 and a funnel 2 of an embodiment of the present invention, and FIG. 2 is a cap body and a cap body in the manufacturing apparatus of the present embodiment. It is a partial enlarged view showing a cap body support mechanism.

The manufacturing apparatus of the present embodiment is provided with a sealing furnace 40 kept at a predetermined temperature distribution. Inside the sealing furnace 40, a metal mesh belt driven by a driving roller (not shown) is provided. The sealing frame base 10, which positions and supports the panel 1 and the funnel 2 on the metal mesh belt, is placed on the metal mesh belt, and the sealing frame base 10 is rotated in the sealing furnace 40 as the metal mesh belt rotates. The panel 1 and the funnel 2 that move together are joined and sealed.

In addition, hot air from a furnace circulation fan (not shown) circulates in the sealing furnace 40 in the direction shown by the dotted arrow in FIG.

The sealing frame base 10 has a base 11 arranged on a metal mesh belt, a column 12 standing upward from the base 11, and a neck of the funnel 2 attached to the column 12. The annular support portion 13 that supports the small diameter portion on the side of the portion 2a, and the panel 1 and the funnel 2 are positioned by contacting the outer periphery of the large diameter portion of the funnel 2 and the outer periphery of the skirt portion 1a of the panel 1 which are arranged at the upper ends of the columns 12. Pad 14a, 14b for performing.

In the sealing furnace 40, the funnel 2
Is supported with the opening side of the neck portion 2a facing downward with respect to the sealing frame base 10. The panel 1 is a frit glass 15 which is a sealing agent applied and formed on the sealing surface with the funnel 2.
Thus, the funnel 2 is sealed and integrally joined. A cap body support mechanism 20 that supports a cap body 30 made of, for example, stainless steel (SUS) is attached to a lower portion of the column 12 of the sealing frame base 10.

As shown in FIG. 2 in which the entire structure of the cap body support mechanism 20 is enlarged, the cap body support mechanism 20 is provided with respect to the support column 12.
Slide body 21 mounted so as to be vertically slidable
A plate 22 protruding laterally from the lower end of the slide body 21, and a lower end portion of the protruding end portion of the plate 22 clamped and fixed by a nut 23 as shown in FIG. A shaft body 24 including a shaft pin 24a and a shaft cylinder 24b, and a shaft cylinder 24b of the shaft body 24.
4 has a cylindrical body 25 as shown in FIG. 4 fitted to a shaft pin 24a, and a disc-shaped receiving plate 26a on the upper end side as shown in FIG. A pedestal 26 having a receiving tube 26b integral with the receiving plate 26a fitted to the protruding recessed pin 26a so that the tip end of the protruding pin 24a abuts on an engaging recess 26c formed therein. have.

The slide body 21 is slidable in the vertical direction with respect to the column 12, and the positioning screw 27 is used.
It is configured to be fixed to the column 12.

On the other hand, as shown in FIG. 2, the dish-shaped cap body 30 disposed below the opening end portion 2b of the neck portion 2a with a predetermined gap t (= about 2 to 5 mm) is provided. A joining plate 31 for joining to the receiving plate 26a is provided on the bottom side, the joining plate 31 and the receiving plate 26a are joined, and both are held by a clip 32, so that the cap is provided at the top of the cap body supporting mechanism 20. The body 30 is detachably supported.

The cap body 30 has a neck portion 2
The opening end 2b of a is open and surrounds the opening end 2b from the lower side, and has a dish shape below the tube axis L of the sealing valve, that is, the center of the inner bottom is the opening end of the neck 2a. Part 2
concave shape away from b (for example, radius of curvature R = 20 to 1)
00 mm), and thus the joint plate 31 side is formed in a convex shape.

Next, a process of manufacturing the sealing valve by sealing and joining the panel 1 and the funnel 2 with the manufacturing apparatus having the above-described structure will be described with reference to FIGS. 6 to 8. FIG. 6 shows the falling frit 15a by the cap body 30.
7 is a partially enlarged view showing a housing state of the sealing furnace 40, FIG. 7 is an explanatory view conceptually showing a changing state of the wind direction of the hot air in the sealing furnace 40 and the wind direction by the cap body 30, and FIG. It is a flow chart which shows a manufacturing process.

The sealing frame base 10 is placed on the metal mesh belt running in the sealing furnace 40, and
Panel 1 and funnel 2 by pads 14a and 14b of
The joint portion of is positioned (step S1), and the panel 1
Then, it is run in the funnel 2 and the sealing furnace 40 (step S2). Then, the joint portion between the panel 1 and the funnel 2 is sealed and bonded by the frit glass 15 (step S).
3).

At this time, a part of the frit glass 15 is
As the falling frit 15a, as shown in FIG.
Although it falls downward in the inside of a and along the outer periphery of the neck portion 2a (more inside the neck portion 2a than outside the neck portion 2a),
The falling-out frit 15a that falls is accommodated in the deepest inner bottom portion of the cap body 30 without adhering to the opening end portion 2b from the gap t between the opening end portion 2b of the neck portion 2a and the cap body 30. (Step S4). As a result, the frit 15 that falls off the open end 2b of the neck 2a
It is possible to avoid the adverse effect that a is attached and the neck portion 2a is cracked.

On the other hand, of the hot air from a furnace circulation fan (not shown), the hot air toward the open end 2b of the neck 2a hits the convex outer surface of the cap body 30 as shown in FIG. It is changed to the side of 30 (step S5). As a result, dust such as iron rust and metal scraps contained in the hot air is collected in the neck portion 2a.
Can be prevented from entering the opening end portion 2b of the above and causing inconvenience such as deterioration of withstand voltage.

In this way, the panel 1 and the funnel 2 are sealed by the frit glass 15 in the sealing furnace 40,
A cap body 30 that is joined and can be configured simply and inexpensively
Also, the sealing valve is manufactured without using the cap body support mechanism 20 to cause the neck portion 2a to crack and to prevent dust from entering the open end portion 2b (step S6).
After this, the sealing valve is carried out of the sealing furnace 40 (step S7), and the process proceeds to the next step such as insertion of an electron gun.

Incidentally, the cap body support mechanism 2 of the present embodiment
Since 0 allows the slide body 21 to be slid in the vertical direction with respect to the column 12, it can also be applied to the funnels 2 having different lengths of the neck portion 2a (that is, sealing valves of different sizes).

Further, since the cap body 30 can be attached to and detached from the cap body support mechanism 20 via the clip 32, the cap body 30 is detached from the cap body support mechanism 20, and the detached frit that has fallen into the cap body 30. The work of removing 15a becomes easy, and the workability in the manufacturing process of the sealing valve can be improved.

[0037]

According to the present invention described above, when the panel and the funnel are sealed with the frit glass as the sealing agent, the cap body and the cap body supporting mechanism having a simple structure are used. , Cathode wire that can manufacture a sealed bulb by accommodating the falling frit without adhering to the neck part and avoiding cracking of the neck part, and eliminating dust ingress from the opening of the neck part to eliminate the factor of characteristic deterioration. A pipe manufacturing apparatus can be provided.

Further, according to the present invention, when the panel and the funnel are sealed with the frit glass as the sealing agent to manufacture the sealing valve, the neck portion can be manufactured by a simple process without increasing the manufacturing cost. Of a cathode ray tube that prevents the fracturing of the neck by preventing the falling frit from adhering to the neck, and prevents dust from entering through the opening of the neck to eliminate the factor of characteristic deterioration while eliminating the factor of characteristic deterioration. A manufacturing apparatus can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a cathode ray tube manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a partial enlarged view showing a cap body and a cap body support mechanism of the present embodiment.

FIG. 3 is a partial enlarged view showing a shaft body of the cap body support mechanism of the present embodiment.

FIG. 4 is a front view showing a tubular body of the cap body support mechanism of the present embodiment.

FIG. 5 is a front view showing the pedestal of the present embodiment.

FIG. 6 is a partially enlarged view showing a state in which a falling frit is accommodated by the cap body in the present embodiment.

FIG. 7 is an explanatory view conceptually showing a change state of the wind direction of hot air and the wind direction by the cap body in the sealing furnace in the present embodiment.

FIG. 8 is a flowchart showing manufacturing steps of the sealing valve according to the present embodiment.

[Explanation of symbols]

1 panel 1a Skirt part 2 funnel 2a neck part 2b Open end 10 Sealing frame 11 bases 12 props 13 Annular support 14a, 14b pads 15 frit glass 15a dropout frit 20 Cap support mechanism 21 slide 22 plates 23 nuts 24 axis 24a axis pin 24b barrel 25 cylinder 26 pedestal 26a support plate 26b Receptacle 27 screws 30 cap body 31 Bonding plate 32 clips 40 sealing furnace

Claims (8)

[Claims] 1. A valve support mechanism for supporting a panel, which is sealed by a sealing agent to be a sealing valve and a funnel having an opening at an end of a neck portion, in a joint arrangement in a sealing furnace, and the neck. Portion of the sealing valve, which covers the opening end and the periphery thereof from below and has a neck-shaped cap body that is open on the neck side facing the opening end with a gap, and a valve of the sealing valve by the valve support mechanism. And a cap body adjusting mechanism that supports the outer bottom portion of the cap body and is capable of adjusting the gap between the cap body and the opening end of the neck portion while being supported so as to be positionally adjustable in the axial direction. Equipment for manufacturing cathode ray tubes. 2. A funnel having an opening at the end of a panel and a neck portion, which is sealed by frit glass and serves as a sealing valve, in a sealing furnace in which hot air is circulated by a circulating fan in the furnace. A valve support mechanism that supports the joining arrangement on the lower side, and the neck side is opened, and is formed in a dish shape so as to cover the opening end of the neck and the periphery thereof from below, and a gap is formed at the opening end. And a cap body that collects the falling frit that falls from the outer periphery of the funnel and that changes the wind direction of the hot air toward the opening end of the neck portion by the in-furnace circulation fan, and the valve support mechanism. The sealing valve is supported so that its position can be adjusted in the tube axis direction, supports the outer bottom portion of the cap body, and allows the gap between the cap body and the open end of the neck portion to be adjusted. Cathode ray tube manufacturing apparatus characterized by comprising: a cap body adjusting mechanism. 3. The cap body adjusting mechanism supports the cap body in a detachable manner by joining a joining plate attached to the bottom portion of the cap body to a receiving plate provided on the top portion and sandwiching the joining plate by a clip. The apparatus for manufacturing a cathode ray tube according to claim 1 or 2. 4. The furnace in which the cap body is formed in a concave shape whose bottom portion is located farthest from the open end of the neck portion to accumulate the falling frit, and the convex outer surface of the cap body faces the open end portion of the neck portion. The apparatus for manufacturing a cathode ray tube according to claim 2 or 3, wherein the direction of hot air by the internal circulation fan is changed. 5. A step of supporting a panel and a funnel having an opening at an end portion of a neck portion in a bonding arrangement in a sealing furnace and sealing them with a sealing agent, and an opening end portion of the neck portion. And a dish-shaped cap body having an opening on the neck portion side, which is arranged so as to cover the periphery thereof from below and is separated from the opening end portion by a gap, prevents the falling sealant from falling off from the vicinity of the outer periphery of the neck portion. A method of manufacturing a cathode ray tube, comprising: a step of integrating without contacting an opening end. 6. A frit in which a panel and a funnel having an opening at the end of the neck portion are supported in a joint arrangement with the funnel side facing downward in a sealing furnace in which hot air is circulated by a circulating fan in the furnace. The step of sealing with glass, and the neck side is opened, and it is formed in a dish shape so as to cover the opening end of the neck and its periphery from below, and the gap between the neck and the opening end can be adjusted. The plate-shaped cap body collects the falling frit that drops from the vicinity of the outer periphery of the neck without contacting the opening end of the neck, and the outer surface of the plate-shaped cap body allows the internal circulation fan to And a step of changing the wind direction of the hot air toward the opening end of the neck portion, the manufacturing method of the cathode ray tube. 7. The dish-shaped cap body is detachably supported by the top of a cap body adjusting mechanism that adjusts a gap between the dish-shaped cap body and the opening end of the neck portion. The method for manufacturing a cathode ray tube according to claim 5 or 6, 8. The furnace in which the cap body is formed in a concave shape whose bottom portion is located farthest from the open end of the neck portion to accommodate the falling frit, and the outer surface of the convex surface faces the open end portion of the neck portion. 8. The method for manufacturing a cathode ray tube according to claim 6, wherein the direction of hot air is changed by the internal circulation fan.