JPH09199022A - Cathode ray tube manufacturing apparatus and cathode ray tube manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a cathode-ray tube of high brightness while improving production efficiency of the cathode-ray tube. SOLUTION: A device comprises a turn table 11 rotationally driven by a rotary shaft 15, support mebber 18 turnably supported to the turn table 11 to support a tube unit 4 injecting a solution containing a phosphor 8 in the interior and a solution discharge drive means turnably drive controlling the support member 18 to discharge the solution injected into the tube unit 4 by tilting it, the solution discharge drive means variably controls a tilt speed tilting the support member 18 supporting the tube unit 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube (cathode-ray tube) which emits light when an inner surface is coated with a phosphor to form a phosphor screen and an electron beam is applied to the phosphor screen.
y tube) manufacturing apparatus and cathode ray tube manufacturing method.

[0002]

2. Description of the Related Art In a television receiver, a phosphor is applied to the screen surface of a tube body which constitutes a cathode ray tube,
When the electron beam is applied to the screen surface, the phosphor emits light and an image is projected. Therefore, in order to project a higher quality image, the cathode ray tube is
Generally, high brightness is required.

In view of this point, in the conventional cathode ray tube, a solution injecting step of injecting a solution into the tube body, a phosphor wetting step of wetting the phosphor into the tube body, and a solution discharging step of draining the solution. It is manufactured by going through.

First, as a first step, a solution injection step of injecting a solution containing a phosphor into a tube body is performed. At this time, the solution used has a weight concentration of 0.0
5 wt% to 0.07 wt% of barium acetate or barium nitrate, and a weight concentration of SiO ₂ of 0.7 wt% to 0.
9% by weight aqueous solution of water glass (SiO ₂ + KSi, Si
O ₂ ) and 0.5 g to 1.5 per tube body
g of phosphor and 300 ml to 500 ml per tube body is used.

Next, as a second step, the phosphor is allowed to settle on the inner surface of the screen surface of the tube body by allowing it to stand for 10 to 20 minutes while the solution is being injected into the tube body, and wetted. A fluorescent substance wet process is performed.

Then, as a third step, a solution discharging step of discharging the solution injected into the tube body by inclining the tube body is performed after the second phosphor wet-bonding step. The inclination speed of the tube body in this solution discharging step is such that when the inclination speed of the tube body is made too high for the phosphor wetted on the inner surface of the screen surface of the tube body, the movement speed of the liquid surface of the solution becomes too high and the coating is performed. It is performed to the extent that unevenness does not occur. That is, the cathode ray tube is
As shown in FIG. 6, when the time from the start of the inclination of the tube body to the end of the inclination of the tube body is about 140 seconds and the inclination speed is about 1.17 degrees / second, as shown in FIG.
The uneven coating of the phosphor occurs on the inner surface of the screen surface.

Therefore, in this solution discharging step, in order to prevent uneven coating of the phosphor on the inner surface of the screen surface, generally, as shown in FIG. It takes about 250 seconds at a constant tilt speed until the end, and the tilt speed is about 0.6 degrees / second.

In addition to the above-described cathode ray tube manufacturing method, a method of increasing the weight concentration of SiO _{2 in} the solution is considered as a method of shortening the time required for the solution discharging step. Has been.

That is, according to such a method, the weight concentration of SiO _{2 in} the above-mentioned solution is 0.7% by weight to 0.
By setting the content to 9% by weight or more, for example, as shown in FIG. 6, when the time from the start of the inclination of the tube body to the end of the inclination of the tube body is about 140 seconds and the inclination speed is about 1.17 degrees / second. Also in this case, the occurrence of coating unevenness can be prevented.

[0010]

However, in manufacturing the cathode ray tube, in the solution discharging step which is the above-mentioned first method of manufacturing the cathode ray tube, as shown in FIG. It has become necessary to further improve the productivity as compared with the case where the inclination speed is about 0.6 degree / second by taking about 250 seconds until the end of the inclination at a constant inclination speed.

As a means for solving such a problem,
A method of increasing the concentration of the aqueous solution of water glass or the weight concentration of the aqueous solution of electrolyte, which is a constituent element of the solution, which is the second manufacturing method of the cathode ray tube has been considered.

However, in the cathode ray tube, when the weight concentration of the solution is increased, the luminance is deteriorated. That is, when the cathode ray tube is manufactured by the method of increasing the weight concentration of the solution, as shown in FIG. 8, the deterioration of the brightness becomes severe as the weight concentration of SiO ₂ is increased. for that reason,
With such a method, a high-luminance cathode ray tube cannot be manufactured, and it becomes difficult to manufacture a television receiver that projects a high-quality image.

Therefore, in order to solve the above-mentioned problems, the present invention shortens the time of the solution discharge process, improves the production efficiency, and manufactures a cathode ray tube having a high brightness. It is proposed for the purpose of providing a method for manufacturing a cathode ray tube.

[0014]

In order to solve the above-mentioned problems, a cathode ray tube manufacturing apparatus according to the present invention has a phosphor screen formed by coating a phosphor on the inner surface of a screen surface. In a manufacturing apparatus of a cathode ray tube that emits light by being irradiated with an electron beam, a supporting member that supports a tube body into which a solution containing a phosphor is injected, and a supporting member that is rotatably driven to control the tube. And a solution discharge driving means for discharging the solution injected into the body by inclining the tube body. Then, the solution discharge driving means changes the tilting speed for tilting the supporting member on which the tube body is supported.

The apparatus for manufacturing a cathode ray tube configured as described above injects a solution into the tube body supported by the support member. In the tube body, when the phosphor contained in the solution precipitates and wets on the inner surface of the screen surface in the tube body, the solution discharge driving means tilts the supporting member at a predetermined tilting speed and tilts the tube body. . At this time, the solution discharge driving means changes the tilting speed of the support member to a predetermined tilting speed in a state where the liquid level of the solution injected into the tube body moves on the inner surface of the screen surface which should be an effective fluorescent surface in the tube body. Control to make it slower. Therefore, the phosphor wetted to the inner surface of the screen surface is controlled so that the moving speed of the liquid surface of the solution is also slow, and is applied without causing uneven coating on the inner surface of the screen surface of the phosphor. .

In the method of manufacturing a cathode ray tube according to the present invention, in order to solve the above problems, a phosphor is applied to the inner surface of the screen to form a phosphor screen, and an electron beam is applied to the phosphor screen. In the method of manufacturing a cathode ray tube which emits light by a support member supporting a tube body into which a solution containing a phosphor is injected, and the support member is rotatably driven and controlled, and the solution injected into the tube body And a solution discharge driving means for discharging the tube body by tilting the tube body, and the solution discharge driving means is a cathode ray tube manufacturing apparatus for varying the tilting speed for tilting the supporting member on which the tube body is supported. The cathode ray tube has a first solution injecting step of injecting a solution into the tube body, and a first step of causing the phosphor to precipitate and wet the inner surface of the screen surface of the tube body in a state where the solution is infused into the tube body. In the step of wetting the phosphor and the step of tilting the support member, which is supported by the solution discharge driving means, at the predetermined tilting speed, the liquid surface of the solution is a screen surface which should be an effective fluorescent surface in the tube. In a state where the inner surface of the tube is moved, the inclination speed is made slower than a predetermined inclination speed, and the solution in the tube body is discharged.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A cathode ray tube manufacturing apparatus and manufacturing method according to the present invention will be described below in detail with reference to the drawings.

Apparatus 1 for manufacturing cathode ray tube 1 which is an embodiment
As for 0, for example, as shown in FIG. 1, a monochrome cathode ray tube 1 is continuously manufactured. The cathode ray tube 1 manufactured by the apparatus 10 for manufacturing the cathode ray tube 1 has a cylindrical neck portion 2 and a funnel portion 3 having a screen surface 5 formed on a bottom surface protruding from the neck portion 2. , And has a tube body 4 whose inside is hermetically closed to be in a vacuum state. The tube body 4 has an electron gun 6 disposed inside the neck portion 2 for emitting an electron beam 9 to the screen surface 5, and an electron gun 6 emitted to both sides outside the neck portion 2. A deflection coil 7 for deflecting electrons is arranged.

The tube body 4 is formed in the shape of a flask as a whole, and is composed of the tubular neck portion 2 and the funnel portion 3 formed to project from the neck portion 2 as described above. The screen surface 5 is formed on the bottom surface of the funnel portion 3. A phosphor 8 is applied to the inner surface of the screen surface 5.

In the cathode ray tube 1 thus constructed, when the television receiver is powered on, the color signal output from the color signal input circuit is input to the electron gun 6. The electron gun 6 emits an electron beam 9 to the screen surface 5.
Then, the electron beam 9 emitted from the electron gun 6 is deflected by the magnetic field of the deflection coil 7, hits the phosphor 8 coated on the screen surface 5, illuminates the phosphor 8, and an image is projected on the screen surface 5. It

The monochrome cathode ray tube 1 thus constructed is continuously manufactured by the following apparatus 10 for manufacturing the cathode ray tube 1 using the turntable 11. That is, as shown in FIGS. 2 and 3, for example, the manufacturing apparatus 10 for the cathode ray tube 1 includes a turntable 11 that is rotationally driven by a rotary shaft 15, and a turntable 11.
A support member 18 rotatably supported by the tube body 4 for supporting the tube body 4 into which the solution containing the phosphor 8 is injected.
And a drive mechanism for rotatably driving the support member 18 to discharge the solution injected into the tube body 4 by tilting the tube body 4.

The turntable 11 is formed in a disk shape, and a cutout recess 12 is formed in the peripheral edge of the turntable 11. A pair of support bases 13 are attached to the turntable 11 on both side surfaces of the cutout recess 12. The support base 13 rotatably supports a support member 18 described later.

The turntable 11 is attached integrally with a rotary shaft 15 for transmitting drive from the rotary drive unit 14 located below the turntable 11 to the turntable 11 at the center. Therefore, the rotary shaft 15 is rotationally driven by the rotary drive unit 14 to rotate the turntable 11 in the direction a shown in FIG.

The support member 18 is arranged in the cutout recess 12 of the turntable 11 and is rotatably supported by the support base 13 described above. Further, the support member 18 is
The arrangement surface 19 of the tube body 4 is formed so that at least one or more tube bodies 4 are detachably fixed. That is, since the tube body 4 is disposed on the support member 18 with the screen surface 5 on the lower side and the neck portion 2 is disposed on the upper side, the disposition surface 19 is disposed on the screen surface 5.
It is formed to be substantially larger. In addition, as shown in FIG.
Two tube bodies 4 are laterally arranged. Therefore, the support member 18 is formed so that the arrangement surface 19 is substantially larger than the screen surface 5 for two surfaces.

Further, the support member 18 is provided with support shafts 20 on both side surfaces thereof. The support shaft 20 is rotatably supported by the support base 13 on the turntable 11 side to rotatably support the support member 18.

The support member 18 thus constructed is detachably fixed to the tube body 4 placed on the placement surface 19, for example, by vacuum suction using a vacuum pad.

The solution discharge drive mechanism is arranged below the turntable 11 and is formed in a ring shape as a whole. The cam member 23 has an inner peripheral edge 24 provided with irregularities.
The slide member 29 which is biased toward the inner peripheral edge 24 of the cam member 23 to slide, and the slide member 29 and the lower surface of the support member 18 are connected to pull the support member 18. The torsion bar 30 is composed of a tension spring 31 that connects the side surface of the support member 18 on the rotary shaft 15 side and the rotary shaft 15 and pulls the support member 18 in the direction of the rotary shaft 15.

As shown in FIG. 4, for example, the cam member 23 is formed in a generally circular ring shape and is fixed to the lower side of the turntable 11. A convex portion 25 is formed on an inner peripheral edge 24 of the cam member 23 at a portion where a solution discharging step for discharging the solution injected into the tube body 4 is performed. Convex surface 26 forming this convex portion 25
Are formed so that the inclination angles are different at points A to G in FIG. 4, respectively. Specifically, the convex surface 26 is formed to have the same inclination angle as that of the tube body at points A ″ to F ″ of the polygonal line shown in FIG. 6, for example. Further, the inclination angle between the points C and D of the convex surface 26 is formed to be smaller than the other points A to C and points D to F. The inclination speed of the support member 18 is determined by the length dimension between the points and the inclination angle.

The slide members 29 are formed in a rectangular shape as a whole, and are arranged below the turntable 11 at the corresponding portions of the support members 18 in the same number as the support members 18 so as to be slidable. There is. The slide member 29 is biased toward the inner peripheral edge 24 of the cam member 23 by the biasing means of the slide member 29 (not shown).
As shown in FIG. 5, the slide mechanism is arranged so as to slide in the e direction and the f direction. In addition, this slide member 29,
Although not shown, the rotary drive unit 14 of the turntable 11 is configured to be driven and transmitted, and is rotationally driven in the same manner as the rotary operation of the turntable 11.

The slide member 29 is connected to the bottom surface of the support member 18 from the top surface by a torsion bar 30. The torsion bar 30 is configured such that the support member 18 is biased in the c direction shown in FIG. 3, and the sliding motion of the slide member 29 is transmitted to the support member 18.

The tension spring 31 is composed of a coil spring, and connects the side surface of the support member 18 on the rotary shaft 15 side and the rotary shaft 15. This tension spring 31
Has one end hooked on a hooking part (not shown) of the support member 18, and the other end hooked on a hooking part provided on the rotary shaft 15. And the tension spring 31 is
The support member 18 is rotated in the direction of the rotation axis 15, that is, b shown in FIG.
Biased in the direction.

Therefore, the supporting member 18 is constituted by the torsion bar 30 and the tension spring 31 as shown in FIG.
3 and the c direction shown in FIG. 3, the support member 18 is held so that the surface 19 on which the tube body 4 is arranged is horizontal.

The cathode ray tube 1 having the above structure
The manufacturing apparatus 10 of FIG.
When 1 is rotationally driven, at the same time, the slide member 29
Is also driven to rotate. The slide member 29 is the cam member 23.
Is moved along the inner peripheral edge 24 side.

The slide member 29 is the cam member 2
When moving along the surface where the convex portion 25 of No. 3 is not formed, the arrangement surface 19 of the support member 18 is moved horizontally by the torsion bar 30 and the tension spring 31. At this time, a solution containing the phosphor 8 therein is injected into the tube body 4 arranged on the support member 18.

The slide member 29 is the cam member 2
It moves along the convex surface 26 of the convex portion 25 formed on the inner peripheral edge 24 of the No. 3. At this time, the slide member 29 urged by the inner peripheral edge 24 of the cam member 23 is pressed by the convex portion 25 and slid in the central direction, that is, in the f direction shown in FIG. When the slide member 29 is slid in the center direction, the support member 18 on which the tube body 4 is arranged is pulled by the torsion bar 30 connecting the slide member 29 and the support member 18, and is moved in the direction c shown in FIG. Inclined. The tube body 4 arranged on the support member 18
, The tilt speed and the tilt angle are regulated in accordance with the tilt angle of the convex surface 26 described above. Then, the support member 18 inclines the tube body 4 and discharges the solution injected therein.

The slide member 29 has a convex surface 26 of the convex portion 25.
3 and is again moved to the inner peripheral edge 24 where the convex portion 25 is not formed, it is moved in the direction e in FIG.
Are held flat again.

The apparatus 10 for manufacturing the cathode ray tube 1 as described above.
Specifically, first, the first solution injecting step of injecting the solution into the tube body 4 is performed, and then, the phosphor 8 is added to the tube body 4 in a state where the solution is injected into the tube body 4. A second phosphor wet-bonding step of depositing on the inner surface of the screen surface 5 and wet-bonding, and then the tube body 4 by the solution discharge drive mechanism.
When the supporting member 18 supported by the above is tilted at a predetermined tilt speed, when the liquid surface of the solution moves on the screen surface 5 which is to be an effective fluorescent screen in the tube body 4, the predetermined tilt speed is set. Decrease the tilting speed further,
The cathode ray tube 1 is manufactured through a third solution discharging step of discharging the solution inside.

In the first solution injection step of injecting the solution into the tube body 4, the phosphor 8 is placed in the tube body 4 placed on the placement surface 19 of the support member 18 by the tube body placement mechanism, which will not be described in detail. A solution containing is injected. At this time, the solution used is barium acetate or barium nitrate having a weight concentration of 0.05% to 0.07% by weight, and water having a weight concentration of SiO ₂ of 0.7% to 0.9% by weight. Glass aqueous solution (SiO ₂ + KSi, SiO ₂ )
And 0.5 g to 1.5 g of phosphor per tube, and 300 per tube.
ml to 500 ml is used.

On the other hand, the slide member 29 disposed below the turntable 11 is positioned in a state of being pressed by the inner peripheral edge 24 of the cam member 23 where the convex surface 26 is not formed. At this time, the support member 18 is urged in the c direction and the d direction shown in FIG. 3 by the torsion bar 30 and the tension spring 31 so that the arrangement surface 19 of the support member 18 becomes horizontal. Held in.

Next, in the second phosphor wetting step in which the phosphor 8 is deposited on the screen surface 5 of the tube body 4 and wetted while the solution is injected into the tube body 4,
From 0 to 20 minutes, the tube body 4 is left with the support member 18 held horizontally. That is, in the solution injected into the tube body 4 during this time, the phosphor 8 injected into the solution is precipitated on the inner surface of the screen surface 5 which is the bottom surface of the tube body 4, and the inner surface of the screen surface 5 is wetted. Is done. Also in this second step, which is the fluorescent material wet-adhering step, the turntable 11 rotates in the direction a shown in FIG. 2, and the slide member 29 also has the same cam member 23 as the first solution injecting step. It moves along the inner peripheral edge 24 where the convex surface 26 is not formed. Therefore, the support member 1
8 is held so that the arrangement surface 19 is horizontal.

Next, in the apparatus 10 for manufacturing the cathode ray tube 1, when the support member 18 supported by the tube body 4 is tilted at a predetermined tilting speed by the solution discharge driving mechanism, the liquid level of the solution becomes In the state where the screen surface 5 to be an effective fluorescent screen inside is moved, the third solution discharging step of discharging the solution in the tube body 4 by making the tilting speed slower than a predetermined tilting speed is performed.

In the solution discharging process, the turntable 1
1 is rotationally driven in the direction a shown in FIG. 2 by the rotary shaft 15, and is rotated and moved to the place where the solution discharging step is performed. At this time, like the rotation of the turntable 11, the slide member 29 is moved in the direction a shown in FIG.
It is moved to point A shown in FIG. Therefore, the tube body 4 is in the state of A ′ shown in FIG. 5 until it is moved to the point A. The tube body 4 has an inclination angle of 0 degree, as shown by A ″ in FIG.

Next, the slide member 29 is B shown in FIG.
When moved to a point, the rotating shaft 15 which is the f direction shown in FIG.
It is slid in the direction. Since the slide member 29 is pressed toward the center by the convex surface 26 of the cam member 23, it is rotated in the direction c shown in FIG. 3 via the torsion bar 30 connecting the support member 18 and the slide member 29. In the tube body 4, the slide member 29 moves from the point A to the point B.
When moved to the point, the state of B ′ shown in FIG. 5 is obtained. That is, the tube body 4 is inclined by about 30 degrees, as indicated by a point B ″ in FIG. The movement of the slide member 29 from the point A to the point B is performed in about 15 seconds, and the tilt speed is set to about 2 degrees / second.

Next, the slide member 29 is C shown in FIG.
When it is moved to the point, it is further slid in the central direction, which is the f direction shown in FIG. The support member 18 is slid by pressing the slide member 29 toward the center by the convex surface 26 of the cam member 23, so that the support member 18 and the slide member 29 are shown in FIG. It is further rotated in the b direction. That is, in the tube body 4, the slide member 29 is moved from the point B shown in FIG.
When moved to the point, the state of C ′ shown in FIG. 5 is obtained. That is, the tube body 4 is further inclined by about 45 degrees from the B '' point as shown by the point C '' in FIG. 6, and is inclined by about 75 degrees as a whole. The movement of the slide member 29 from the point B to the point C is performed in about 35 seconds, and the tilt speed is set to about 1.2 degrees / second. On this occasion,
The liquid surface of the solution in the tube body 4 is in a state of approaching the inner surface to be the screen surface 5 of the tube body 4, as shown in C ′ of FIG.

Next, the slide member 29 is moved to D shown in FIG.
When it is moved to the point, it is further slid in the central direction, which is the f direction shown in FIG. Since the slide member 29 is pressed toward the center by the convex surface 26 of the cam member 23, the support member 18 is further moved in the b direction shown in FIG. 2 via the torsion bar 30 connecting the support member 18 and the slide member 29. Is rotated. That is, in the tube body 4, when the slide member 29 is moved from the point C shown in FIG. 4 to the point D,
The state of D ′ shown in FIG. 5 is set. That is, the tube body 4 is further tilted by about 25 degrees from the C ″ point, as shown by point D ″ in FIG. Then, from the point C of the slide member 29 to the point D
The movement to the point is performed in about 45 seconds, and the inclination speed is set to about 0.6 degree / second. At this time, the liquid level of the solution in the tube body 4 is, as shown in D ′ of FIG.
It is in a state of passing through to the inner surface which becomes the screen surface 5 of.

As described above, the tube body 4 is
In the state of passing through the inner surface which becomes the screen surface 5 when the solution in the inside is discharged, the inclination speed is from points A to C shown in FIG.
The tilting speed between the points C and D is slower than the tilting speed between the points. Therefore, the phosphors 8 deposited on the inner surface of the screen surface 5 in the tube body 4 are, as shown in FIG.
When the inclination speed is 0.7 degrees / second or less, the moving speed of the solution in the tube body 4 is also slowed down, and uneven coating can be prevented.

Next, the slide member 29 is attached to E shown in FIG.
When it is moved to the point, it is further slid in the central direction, which is the f direction shown in FIG. Since the slide member 29 is pressed in the center direction by the convex surface 26 of the cam member 23, the support member 18 further rotates in the direction b in FIG. 2 via the torsion bar 30 connecting the support member 18 and the slide member 29. To be done. That is, when the slide member 29 is moved from point D to point E shown in FIG.
The state of E ′ shown in FIG. That is, the tube body 4
6 is further inclined by about 20 degrees from the D '' point, as indicated by point E '' shown in FIG. 6, and is inclined by about 120 degrees as a whole. The movement of the slide member 29 from the point D to the point E is performed in about 15 seconds, and the tilt speed is set to about 1.3 degrees / second.

Next, the slide member 29 is F shown in FIG.
When it is moved to the point, it is further slid in the central direction, which is the f direction shown in FIG. Since the slide member 29 is pressed in the center direction by the convex surface 26 of the cam member 23, the support member 18 further rotates in the direction b in FIG. 2 via the torsion bar 30 connecting the support member 18 and the slide member 29. To be done. That is, when the slide member 29 is moved from the point E shown in FIG.
The state of F ′ shown in FIG. That is, the tube body 4
6 is further inclined by about 20 degrees from the E '' point as indicated by point F '' shown in FIG. 6, and is inclined by about 140 degrees as a whole. The movement of the slide member 29 from the point E to the point F is performed in about 10 seconds, and the tilt speed is set to about 2.0 degrees / second. Then, the slide member 29
Is further slid in the direction of the rotating shaft 15, and in the state where it is moved to point F shown in FIG. 4, all the solution in the tube body 4 is discharged.

When the slide member 29 is moved to the point G shown in FIG. 4, the slide member 29 is further slid in the outward direction of the cam member 23 which is the e direction shown in FIG. The slide member 29 ends the movement of the convex surface 26 of the cam member 23, and is moved again to the inner peripheral edge 24 of the cam member 23 where the convex portion 25 is not formed. Then, the support member 18 is again placed on the placement surface 19
Is in a horizontal state, and the tube body 4 is in a horizontal state, that is, the state of point A shown in FIG. 4 described above.

The inclination angle and the inclination speed of the tube body 4 may be such that the inclination speed between points C'to D'in FIG. A'to C '
The inclination angle and the inclination speed of the tube body 4 from D ′ to D ′ to F ′ are not limited to the above numerical values.

As described above, the apparatus 10 for manufacturing the cathode ray tube 1
In the state where the phosphor 8 is wetted on the inner surface of the screen surface 5 of the tube body 4, the tube body 4 is detached from the support member 18 by the tube body detaching mechanism which will not be described in detail. Then, in the tube body 4 in which the phosphor 8 is wetted on the inner surface of the screen surface 5, after the phosphor 8 is dried, the intermediate film and the metal back are applied or vapor-deposited, and then the intermediate film is burned. After the intermediate film is burned, the tube body 4 is attached with the above-mentioned members such as the electron gun 6 and sealed in a state where the inside is evacuated.

According to the apparatus 10 for manufacturing the cathode ray tube 1 as described above, the tube body 4 has an inclination speed as shown in FIG. 5 when passing through the inner surface which becomes the screen surface 5 when the solution in the tube body 4 is discharged. The inclination speed between points C and D is slower than the inclination speed between points A and C shown in FIG. Therefore, the phosphor 8 deposited on the inner surface of the screen surface 5 in the tube body 4 has an inclination speed of 0.7 as shown in FIG.
When the rate is less than or equal to the degree / second, the moving speed of the solution in the tube body 4 is also slowed down, and the occurrence of coating unevenness can be prevented. On the other hand, when the slide member 29 is located at a position other than the point C to the point D shown in FIG. 4, the inclination speed is high, so that it takes about 140 seconds to complete the third solution discharging step. Therefore, the time required for manufacturing the cathode ray tube 1 can be shortened as compared with the conventional case, and the production efficiency of the cathode ray tube 1 can be improved.

Also, a manufacturing apparatus 1 for such a cathode ray tube 1
According to 0, it is possible to manufacture the high-brightness cathode ray tube 1 without increasing the concentration of SiO ₂ in the solution as in the conventional case while improving the production efficiency.

The apparatus 10 for manufacturing the cathode ray tube 1 described in detail above has a cam member 23 as a solution discharging drive mechanism,
Although the torsion bar 30, the tension spring 31, and the slide member 29 are used for the description, the solution discharge drive mechanism may of course control the tilting speed of the support member 18 by an air cylinder or the like.

When manufacturing a color cathode ray tube, R (red), G (green) and B (bl) are used.
The fluorescent substance of ue) may be applied to the inner surface of the screen surface by the manufacturing method described above.

[0056]

According to the apparatus for manufacturing a cathode ray tube according to the present invention, when the solution discharged into the tube body is discharged by the solution discharge driving means while the support member is inclined at a predetermined inclination speed, the solution is discharged. In the state of passing through the inner surface of the screen surface that should be an effective fluorescent screen in the tube body, the inclination speed of the supporting member can be changed so as to be slower than a predetermined inclination speed, so that the coating of the cathode ray tube can be performed without causing uneven coating. The time required for manufacturing can be shortened, and the production efficiency of a high-luminance cathode ray tube can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a cathode ray tube manufactured by a cathode ray tube manufacturing apparatus according to the present invention.

FIG. 2 is a top view of the apparatus for manufacturing the cathode ray tube.

FIG. 3 is a side view of a main part of the manufacturing apparatus of the cathode ray tube.

FIG. 4 is a top view showing a state where a slide member is pressed by a cam member of the apparatus for manufacturing a cathode ray tube.

FIG. 5 is a process diagram showing a tilted state of a tube body in a solution discharge means of the apparatus for manufacturing a cathode ray tube.

FIG. 6 is a diagram showing the relationship between the inclination angle of the tube body and the drainage time of the solution in the cathode ray tube manufacturing apparatus.

FIG. 7 is a diagram showing the relationship between the inclination speed of the tube body and the coating unevenness of the phosphor.

FIG. 8 is a diagram showing the relationship between the concentration of SiO _{2 in} a solution and luminance deterioration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cathode ray tube 4 tube body 5 screen surface 6 electron gun 8 fluorescent substance 9 electron beam 10 manufacturing device 11 turntable 14 rotary drive unit 15 rotary shaft 18 support member 23 cam member 24 inner peripheral edge 29 slide member 30 torsion bar 31 tension spring

Claims (5)

[Claims] 1. A cathode ray tube manufacturing apparatus in which a phosphor is applied to an inner surface of a screen surface to form a phosphor surface, and the phosphor surface is irradiated with an electron beam to emit light. A support member for supporting the tube body into which the solution is injected; and a solution discharge drive means for rotatably drivingly controlling the support member and discharging the solution injected into the tube body by tilting the tube body. The discharge driving means varies a tilting speed for tilting a supporting member that supports the tube body. 2. The solution discharge driving means, when the solution injected into the tube body is discharged while inclining the support member at a predetermined inclination speed, the liquid level of the solution should become an effective fluorescent surface inside the tube body. The apparatus for manufacturing a cathode ray tube according to claim 1, wherein the tilting speed of the support member is set to be lower than a predetermined tilting speed when the inner surface of the screen surface is moved. 3. The solution comprises barium acetate or barium nitrate having a weight concentration of 0.05% by weight to 0.07% by weight, and S.
Consists of a water glass aqueous solution (SiO ₂ + KSi, SiO ₂ ) having a weight concentration of iO ₂ of 0.7 wt% to 0.9 wt% and a phosphor of 0.5 g to 1.5 g per tube body. The solution discharge driving means moves the tilt speed of the support member to 0.7 degrees / in a state where the liquid surface of the solution injected into the tube body moves on the inner surface of the screen surface which should be an effective fluorescent surface in the tube body. The apparatus for manufacturing a cathode ray tube according to claim 2, wherein the manufacturing time is set to not more than a second. 4. A method of manufacturing a cathode ray tube in which a phosphor is applied to an inner surface of a screen surface to form a phosphor surface, and the phosphor surface is irradiated with an electron beam so as to emit light. A support member for supporting the tube body into which the solution is injected; and a solution discharge drive means for rotatably drivingly controlling the support member and discharging the solution injected into the tube body by tilting the tube body. The discharge driving means uses a cathode ray tube manufacturing apparatus that changes the tilting speed for tilting the supporting member that supports the tube body, and a first solution injecting step of injecting the solution into the tube body and the solution in the tube body. Secondly, the phosphor is deposited and wetted on the inner surface of the screen surface of the tube body in the state of being injected.
In the fluorescent substance wetting step and when inclining the support member, which is supported by the solution discharge driving means, of the tube body at a predetermined inclination speed, the liquid surface of the solution of the screen surface which should become an effective fluorescent surface in the tube body. A third solution discharging step of discharging the solution in the tube body by lowering the tilting speed below a predetermined tilting speed while the inner surface is moving, and a method for manufacturing a cathode ray tube. 5. The solution comprises barium acetate or barium nitrate having a weight concentration of 0.05% to 0.07% by weight, and S.
Consists of a water glass aqueous solution (SiO ₂ + KSi, SiO ₂ ) having a weight concentration of iO ₂ of 0.7 wt% to 0.9 wt% and a phosphor of 0.5 g to 1.5 g per tube body. In the third solution discharging step, the tilting speed of the supporting member is set to 0.7 degrees / second or less in a state where the liquid surface of the solution moves on the inner surface of the screen surface which should be an effective fluorescent surface in the tube body. The method of manufacturing a cathode ray tube according to claim 4, wherein: