JPH0785399B2 - Method for manufacturing cathode ray tube - Google Patents

Description

The present invention relates to a method for manufacturing a cathode ray tube.

[Outline of Invention]

The present invention relates to a method of manufacturing a cathode ray tube in which heating for prebaking, flit sealing, and exhaust treatment is performed in the same step, using a tube assembly with three positioning means and at least two butting means. By manufacturing while arranging so that the tube axis is vertical, it is possible to solve the problems particularly when manufacturing a large-sized cathode ray tube.

[Conventional technology]

Prebaking, frit sealing, and exhaust treatment are processes that require heat treatment in the manufacture of color cathode ray tubes. Pre-baking is a process of burning away the organic substances such as the binder in the phosphor coating on the color phosphor surface, the intermediate film applied between the phosphor coating and the metal back layer, and the frit seal is a panel using a glass frit. And the exhaust process is an exhaust process for sealing the exhaust pipe while maintaining a high degree of vacuum inside the pipe body. Conventionally,
These three configurations were performed in independent steps. However, with the development of glass processing technology as in the present, when a color cathode ray tube with a size of 30 inches or more, that is, a so-called super-large-sized tube has come to be manufactured, in the above three steps,
The thermal strain and vacuum stress applied to the cathode ray tube have become so large that they cannot be ignored compared with the case of the conventional small tube. Therefore,
In order to solve such problems, the applicant of the present invention has proposed a method of manufacturing a cathode ray tube in which heating for prebaking, flit sealing, and exhaust treatment can be performed in the same step in Japanese Patent Application No. 59-217033. .

[Problems to be solved by the invention]

In a conventional frit sealing process, a pedestal (3) is used to accurately hold the panel (1) and the funnel (2) as shown in FIG. In this stand (3), one of the L-shaped upper frames (4a) and (4b) (4
A) is provided with two positioning portions (5a) and (5b), and the other frame (4b) is provided with one positioning portion (5c). And, each of the positioning parts (5a) to (5c) has a panel (1) and a funnel (2) or a panel (1).
A pad (6) is provided which only abuts. Also, below the funnel (2), there are three support pieces (7a),
(7b) and (7c) are provided, and these three support pieces (7
a) to (7c) and three positioning portions (5a) to (5c) hold the pipe axis so as to incline to one diagonal side of the panel (1) as shown in the drawing, and the panel (1) And the funnel (2) are prevented from moving. By the way, in the case of performing the frit sealing while inclining the tube assembly (9) to one side in this way, the larger the cathode ray tube is, the heavier the tube assembly (9) is and the thicker the glass is. Therefore, thermal and mechanical stress concentration occurs in the tube assembly (9) that is abutted against the positioning portions (5a) to (5c), and there is a risk of cracking from this portion. Further, in the manufacturing method in which the heating for the pre-baking, flit sealing, and exhaust treatment is performed in the same step, the respective treatments are performed using the same mount (3). When 9) is inclined, there is a problem in that the exhaust system becomes long and the exhaust treatment device and the jig become complicated.

The present invention provides a method for manufacturing a cathode ray tube which can solve the above problems.

[Means for solving problems]

The present invention relates to a tube assembly in a state in which the opening end face of a panel having a fluorescent surface is abutted and held through a frit material to the opening end face of a funnel having a neck portion in which an electron gun is arranged. In the method of manufacturing a cathode ray tube in which pre-baking on the fluorescent surface, frit sealing between the funnel and the panel, and heating for exhaust treatment are performed in the same step, the tube assembly (33) is positioned at three points, that is, three points. The positioning means (15) and at least two points of butting, that is, at least two butting means (16) are arranged so that the pipe axis is vertical.

These positioning means (15) and abutting means (16) are
Two positioning means (15a), (15b) are arranged near one corner so as to be orthogonal to each other, and
Two abutting means (16a) and (16b) are arranged near the other corners located diagonally with respect to the respective positioning means (15a) and (15b). Then, the other positioning means (15c) is arranged near the other corner of the horizontal side where the positioning means (15b) is arranged. When two or more abutting means (16) are arranged, the positioning means (1
5) Alternatively, the abutting means (16c), (16d) and (16e) may be similarly arranged near the corner where the abutting means (16) is not arranged.

The positioning means (15) and the abutting means (16) may have any structures, but the shafts (27) and (39) provided with the pads (31) and (43) and the shaft support tool (28), It is better to have a structure that can be separated from (40).

[Action]

According to the present invention, when the heat treatments for pre-baking, flit sealing and exhaust treatment are performed in the same step, the cathode ray tube is arranged so that its tube axis is vertical, so that when using a conventional mount. The concentration of stress on the portion that abuts on the positioning portion of the cathode ray tube is eliminated. Further, even if the cathode ray tube is not held tilted, the abutment means is provided to prevent movement of the panel and the funnel during frit sealing.

〔Example〕

In FIGS. 1 and 2, (33) is a tube assembly, and (1)
1) shows the mounting device. The tube assembly (33) is located at a predetermined position in the neck portion (61) of the funnel (18), and the electron gun (60)
, And the glass stem having the terminal pin is heated and welded to the end portion of the neck portion, and the opening end surface of the funnel (18) having the neck portion (61) accommodating and placing the electron gun (60), The opening end faces of the panel (17) are formed by abutting a predetermined positional relationship with each other. The inner surface of this panel (17) is provided with a fluorescent surface, for example, a fluorescent surface in which a color fluorescent coating film is provided with a metal back, but it has not been subjected to a baking treatment, that is, a heat treatment. The panel (17) and the funnel (18) are open, and the frit material is applied to at least one of the open end surfaces of the panel (17).

The mounting device (11) for the pipe assembly (33) is a moving table (12).
And a mounting table (14) supported by the legs (13) on this
And three positioning means (15a), (15b), (15c) and two abutting means (16a), (16b) provided on the mounting table (14). In FIG. 2, (19) is a getter container, (20) is a holder for the tube assembly (33), (21) is a net checking, (22).
Is a coil for burning the gun to burn off the deposits on the electron gun, (23) is an exhaust pipe sealing coil, (24) is an exhaust pipe,
(25) is a pipe connected to the exhaust system.

Next, referring to FIGS. 3 to 5, the positioning means (15)
An example of [(15a) to (15c)] will be described.

The positioning means (15) has a positioning section (26a) provided at a position where one is abutted against the panel (17) and a positioning section (26a) provided at a position where the other is abutted against the funnel (18). A shaft (27) having 26b), a shaft support (28) adapted to be connected to the shaft (27), and a screw (29) for fixing the connected shaft (27) and the shaft support (28). ) Is provided in the tubular collar (30). This positioning part (26)
[(26a), (26b)] is provided with a pad (31) made of carbon which is directly abutted against the panel (17) or the funnel (18) at one end, and the pipe assembly (3
Be able to adjust the proper distance between 3) and the pad (31). The connection portion between the shaft (27) and the shaft support (28) has a shaft support (28) so that the shaft (27) can move not only vertically but also laterally with respect to the shaft support (28). The convex part (34) is formed in the central part of the shank (27) and this convex part (34) is formed in the shaft (27).
A recess (35) is formed to be fitted with. (36) is Natsu,
(37) is a groove in which the screw (29) moves as the collar (30) moves.

Next, the abutting means (16) with reference to FIGS.
An embodiment of [(16a), (16b)] will be described.

The abutting means (16) has an abutting part (38a) provided at a position where one is abutted against the panel (17) and an abutting part (38a) provided at a position where the other is abutted against the funnel (18). 38b) a shaft (39), a shaft support (40) adapted to be connected to the shaft (39), and a screw (41) for fixing the connected shaft (39) and the shaft support (40). ) Is provided in the collar (42). This butting part (38) [(38
a), (38b)], one end is provided with a pad (43) made of carbon that directly abuts against the panel (17) or the funnel (18), and this pad (43) is between the washer (44). Allow the spring (45) to extend and contract. As a result, the thermal expansion of the tube body (33) and the positioning means (15) during heating is absorbed, and cracking of the tube body (33) can be prevented. This butting part (3
The distance of 8) to the tube assembly (33) can be adjusted by the screw (62). The structure of the connecting portion between the shaft (39) and the shaft support (40) has a positioning means (1
This is the same as the structure of the connecting portion between the shaft (27) and the shaft support (28) in 5). Therefore, the Shaft (3
Since 9) can be taken out in the lateral direction, even if the frit is protruding from the pipe body, there is no risk of contacting the frit when removing it.

The positioning means (15) shown in FIGS. 3 and 4 shows a state in which the collar (30) is lowered and the shaft (27) and the shaft support (28) are fixed by the screw (29), and FIG. And the seventh
The abutting means (16) shown in the figure raises the collar (42) to move the shaft (39) from the shaft support (40) in the lateral direction (A).
Direction) shows the state that it can be removed.

9 to 11 show another embodiment of the connecting structure in the abutting means (16). The shaft support (40) has a convex portion (47) whose opposing side surfaces (46a) and (46b) are parallel planes, and a cylindrical convex portion (48) located on the convex portion (47). ) Is formed, and recesses (49) and (50) that can be fitted to the projections (47) and (48) on the shaft support tool (40) side are formed in the shaft (39). This connecting portion is preferably ground to obtain a good connected state. In the case of this abutting means (16), it is not necessary to provide the collar (42) in the above-mentioned embodiment, but removal of the shaft (39) is limited to lifting the shaft (39) in the vertical direction.

These positioning means (15) and abutting means (16) are
Two positioning means (15a), (15b) are provided at one corner E
And two abutting means near the other corner F located diagonally with respect to these two locating means (15a), (15b). Place (16a) and (16b). Then, the other positioning means (15c) is arranged near the other corner G of the horizontal side where the positioning means (15b) is arranged. When two or more butting means (16) are arranged, the butting means (16c) is located near the corner G or H where the positioning means (15) or the butting means (16) is not arranged. , (16d), (16
e) can be arranged similarly.

Then, in the mounting device (11) according to the present invention described above, the panel assembly (17) and the funnel (18) are not yet joined to each other in a state where the panel (17) and the funnel (18) are butted against each other in a predetermined positional relationship.
3) is arranged so that the tube axis is vertical and fixed by respective positioning means (15) and abutting means (16), and then a mounting device on which this tube assembly (33) is mounted. (11) is put into a heating furnace (not shown). In this heating furnace, each part is maintained in a predetermined temperature distribution, and by relatively passing the tube assembly (33) into the heating furnace, for example, 450
At the same time, the baking treatment or pre-baking treatment on the fluorescent surface at ℃ and the heat joining or frit sealing treatment with the frit material between the funnel (18) and the panel (17) are performed at the same time, and then the temperature is lowered to some extent (the same heating In the furnace, it can be carried out by moving the moving table (12) to a place with a low temperature), and exhaust treatment is performed. When the temperature is further lowered, gun baking is performed, and when the temperature is lowered to about 100 ° C., the exhaust pipe (24) is welded and sealed. Then, the getter material in the getter container (19) is heated to 80
The target cathode ray tube is manufactured by heating at high temperature of about 0 to 900 ° C. and evaporating it to gettering.

〔The invention's effect〕

According to the present invention, in the method of manufacturing a cathode ray tube in which the heat treatments for prebaking, flit sealing, and exhaust treatment are performed in the same step, the tube assembly is arranged so that its tube axis is vertical. As described above, there is no fear that the stress is concentrated in a part of the tube assembly and is concentrated from the stress, and the stress is broken. Also, even if they are arranged so that the tube axis is vertical,
Since the abutting means are provided at at least two locations in addition to the three positioning means, movement of the panel and the funnel during frit sealing is prevented. Further, as compared with the case where the pipe assembly is arranged at an inclination, it is not necessary to incline the vacuum pump head portion, so that there is an advantage that the structure of the exhaust treatment device is simplified. Therefore, the present invention is particularly suitable for manufacturing a large-sized cathode ray tube.

[Brief description of drawings]

FIG. 1 is a plan view of a mounting apparatus for a pipe assembly according to the present invention,
2 is a front view thereof, FIG. 3 is a front view of the positioning means,
4 is its side view, FIG. 5 is its plan view, FIG. 6 is a front view of the abutting means, FIG. 7 is its side view, FIG. 8 is its plan view, and FIG. FIG. 10 is a view showing a connecting structure of the contact means, FIG. 10 is a bottom view of the shaft, FIG. 11 is a plan view of the shaft support, and FIG. 12 is a perspective view of a conventional mount. (11) is a mounting device for the pipe assembly, (15) [15a], (15)
b)] is positioning means, (16) [(16a) to (16e)] is abutting means, (17) is a panel, (18) is a funnel,
(26) [(26a), (26b)] are positioning portions, (27) is a shaft, (28) is a shaft support, (33) is a tube assembly, (38) [(38a), (38b) )] Is the butting part, (39)
Is a shaft, and (40) is a shaft support.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-149629 (JP, A) JP-A-54-12258 (JP, A) JP-A-52-154338 (JP, A) Actual development Sho-48- 102940 (JP, U) Actually opened 52-124654 (JP, U)

Claims (1)

[Claims] 1. A tube assembly in a state in which an opening end surface of a panel having a fluorescent surface is abutted and held via a frit material to an opening end surface of a funnel having a neck portion in which an electron gun is arranged. On the other hand, in the method of manufacturing a cathode ray tube in which prebaking, frit sealing and heating for exhaust treatment are performed in the same step, the tube axis is made vertical by positioning the tube assembly at three points and abutting at least two points. A method of manufacturing a cathode ray tube, characterized in that the cathode ray tube is manufactured while being arranged.