JP3404824B2 - Liquid injection method, liquid injection jig, and method of manufacturing liquid-cooled cathode ray tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid pouring method and a liquid pouring jig applicable to a cooling liquid pouring process of a liquid cooling type cathode ray tube for a projector, for example. The present invention also relates to a method for manufacturing a liquid-cooled cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a video projector in which red, green and blue monochromatic cathode ray tubes are arranged in-line and an image is formed on a screen by a projection lens system arranged in front of each monochromatic cathode ray tube. FIG. 9 shows a liquid cooling section of a liquid cooling type cathode ray tube for a typical projector.
As shown in the figure, the coupler 4 is attached to the front surface of a glass panel 41 having a fluorescent screen 40 by an adhesive 42.
3 is attached, and the final lens 45 is fixed to the coupler 43 by the final lens fixing bracket 44. Then, the front surface of the panel 41, the coupler 43, and the final lens 45.
The cooling liquid 46 is injected into the space surrounded by, and the injection port 48 is sealed by the sealing screw 47.

FIG. 10 shows a conventional method of injecting a cooling liquid 46. First, as shown in FIG. 10A, the injection nozzle 49 is inserted into the injection port 48 of the assembled liquid cooling unit,
The cooling liquid 46 is injected by operating an injection pump (not shown). Then, when the liquid level of the cooling liquid 46 reaches near the injection port 48, as shown in FIG.
While operating the injection pump while raising, the tip of the injection nozzle 49 is pulled out to the injection port 48 so that air does not remain in the liquid. Further, the amount of liquid from the injection pump is finely adjusted so that the cooling liquid 46 does not overflow, and the injection pump is stopped when the liquid surface reaches a predetermined position. After that, FIG. 10C
As shown in FIG. 5, the sealing screw 47 is tightened to seal the injection port 48.

[0004]

By the way, in such a liquid-cooled cathode ray tube, if air bubbles exist inside the cooling liquid 46, there is a problem that image quality is deteriorated due to optical scattering due to the air bubbles. For this reason, the cooling liquid 46 that has been degassed in vacuum must be completely filled in the liquid cooling section so that no bubbles remain (100% injection). However, in such 100% injection, since the cooling liquid 46 is filled up to the injection port 48, great care must be taken to prevent the cooling liquid 46 from overflowing. However, since the volume of the space filled with the above-described cooling liquid 46 varies to some extent depending on the precision of parts and the assembly precision, and the precision of the injection pump also includes variation, it is necessary to use a precise injection pump. However, in order to perform 100% implantation completely, the final fine adjustment is necessary as described above. However, this work must be performed from the lens side while visually observing the state of the injection nozzle 49 inside, and as a result, the conventional method has a poor work efficiency and is difficult to automate the injection process.

The present invention has been made in view of the above points of the conventional example, and an object of the present invention is to provide a liquid injection method and a liquid injection which can improve the work efficiency by eliminating the need for fine adjustment of the liquid amount in the injection step. To provide a jig. The present invention provides a method for manufacturing a liquid-cooled cathode ray tube in which no bubbles remain in the cooling liquid.

[0006]

A liquid injection method according to the present invention comprises a step of injecting a liquid into a room through an injection nozzle which is inserted into an injection port and movable inside the room, and sucks residual air in the room. The method is characterized by including a step of evacuating, a step of overflowing the liquid from the injection port, a step of sucking and removing the overflowing liquid and pulling out the injection nozzle from the liquid, and a step of hermetically sealing the injection port. . The liquid injection jig according to the present invention is for connecting the nozzle insertion hole for movably inserting the injection nozzle to the liquid injection port and for sucking the liquid overflowing from the injection port, which is connected to the nozzle insertion hole. And an air port connected to the nozzle insertion hole for sucking air from the vicinity of the injection port. The manufacturing method of the liquid-cooled cathode ray tube according to the present invention, in the space filled with the cooling liquid of the liquid-cooled cathode ray tube, suction and exhaust the residual air in the space while filling the cooling liquid through the inlet, It is characterized in that the cooling liquid overflowing from the inlet is sucked and removed, and then the inlet is hermetically sealed. A method for manufacturing a liquid-cooled cathode ray tube according to the present invention is a space for inserting a cooling liquid injection port provided in a space surrounded by a front surface of a panel, a coupler and a final lens, and a movable injection nozzle in the space. The process of injecting the cooling liquid into the inside, the process of sucking and exhausting the residual air in the space, the process of overflowing the cooling liquid from the injection port, the process of sucking and removing the overflowing cooling liquid and withdrawing the injection nozzle from the cooling liquid And a step of hermetically sealing the injection port.

[0007]

According to the liquid injection method of the present invention, the liquid is injected from the injection port through the injection nozzle movably inserted into the chamber, the residual air in the chamber is sucked and exhausted, and the liquid is overflowed from the injection port. , The overflowing liquid is removed by suction and the injection nozzle is pulled out from the liquid, and then the injection port is hermetically sealed, so that the liquid is injected into the injection port without generating bubbles and is sealed. , Fine adjustment is not necessary to prevent the liquid from overflowing from the inlet. According to the liquid injection jig of the present invention, the liquid injected by the injection nozzle and overflowing from the injection port is sucked from the suction port of the injection jig, and at that time, the air in the vicinity of the injection port is sucked from the air port. Therefore, the liquid is efficiently removed. According to the method for manufacturing a liquid-cooled cathode ray tube of the present invention, in the space filled with the cooling liquid of the liquid-cooled cathode ray tube, the residual air in the space is sucked and exhausted while filling the cooling liquid through the inlet, Then, the cooling liquid overflowing from the inlet is removed by suction, and then the inlet is hermetically sealed, so that the cooling liquid is injected to the inlet without generating bubbles, and is sealed. A liquid-cooled cathode ray tube with good image quality can be manufactured because the cooling liquid can be enclosed without bubbles. According to the method for manufacturing a liquid-cooled cathode ray tube of the present invention, the cooling liquid is injected from the injection port through the injection nozzle movably inserted into the space surrounded by the panel front surface, the coupler and the final lens, The residual air of
The cooling liquid is made to overflow from the inlet, the overflowing cooling liquid is sucked and removed, the injection nozzle is pulled out from the cooling liquid, and then the injection port is hermetically sealed, so that the cooling liquid does not generate bubbles. In the space surrounded by the front surface of the panel, the coupler, and the final lens, the liquid-cooled cathode ray tube with high image quality is manufactured by injecting it into the injection port without air bubbles and enclosing it.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. This embodiment is applied to a lens-integrated liquid-cooled cathode ray tube used in a rear projection TV.

5 to 7 show the overall structure of a liquid-cooled cathode ray tube to which the present invention is applied. As shown in FIG. 5, a tube body 4 is composed of a panel 1, a funnel 2 and a neck tube 3 each made of glass. On the inner surface of the panel 1, for example, a phosphor layer 5 of any color of red, green or blue is provided.
Is formed. In this embodiment, the panel 1 forms a convex lens. Further, the electron gun 6 is provided in the neck tube 3.
Are arranged.

A coupler 7, which is a frame, is attached to the front surface of the panel 1 with an adhesive a. Then, the final lens 9 is fixed to the coupler 7 by the final lens fixing fitting 8. In addition, between the final lens 9 and the coupler 8,
A packing 10 for maintaining an airtight state is arranged.

The space surrounded by the front surface of the panel 1, the coupler 7 and the final lens 9, that is, the cooling chamber R is filled with the cooling liquid 12 through the inlet 11 by the method described later. As the cooling liquid 12, for example, a mixture of ethylene glycol as a main component and about 20% by weight of glycerin or water is used. Then, as shown in FIG. 6, the cooling liquid 12 is sealed by attaching the sealing screw 14 to the inlet 11 via the packing 13.

Further, as shown in FIG. 7, a lens barrel 16 having a plurality of optical lenses 15 is attached to the portion of the coupler 7 on the final lens 9 side. In this case, the lens barrel 1 is formed by fitting the positioning pin 17 provided on the coupler 7 and the recess 18 provided on the lens barrel 16.
Position 6

FIG. 1 shows the basic construction of an injection jig 20 of this embodiment. As shown in the figure, the injection jig 20 is provided with a nozzle insertion hole 23 for inserting the injection nozzle 22 in the longitudinal direction of a cylindrical jig body 21. In this case, the outer diameter of the injection nozzle 22 and the nozzle insertion hole 2
The inner diameter of 3 is set to a value that maintains appropriate airtightness. For example, when the outer diameter of the injection nozzle 22 is N = 2.5 mm, the inner diameter of the nozzle insertion hole 23 is A = 2.55 to 2.7 m.
m is suitable.

As shown in FIGS. 1A and 1B, a hole 24 is formed at one end of the injection nozzle 22 for sucking the overflowing cooling liquid 12 as described later. The inner diameter of the hole 24 needs to be sufficiently larger than the outer diameter of the injection nozzle 22, and the outer diameter of the injection nozzle 22 is N = 2.
In the case of 5 mm, the inner diameter of the hole 24 is set to B = 3 to 5 so as to match the size of the mounting portion of the packing 13 of the injection port 11.
It is preferably mm.

In the case of this embodiment, N =
When 2.5 mm, A = 2.7 mm and B = 4 mm were set, good results were obtained.

Further, a protrusion 25 is formed on the side of the hole 24 of the jig body 21, and four slits 26 are formed in the protrusion 25 at equal intervals. In the case of this embodiment, the width of the slit 26 is S = 1.5 mm and the depth is D =
When it was set to 1.5 mm, good results were obtained.

On the other hand, the hole 2 is formed on the side of the jig body 21.
A suction port 27 for sucking the overflowing cooling liquid 12 is formed in the vicinity of 4. The suction port 27 is connected to the injection hole 23 and the hole portion 24 described above. Also, this suction port 2
A suction pipe 29 is attached to 7 through a suction pipe joint 28.

Next, a method of injecting the cooling liquid 12 using the above-mentioned injection jig 20 will be described with reference to FIGS.

First, as shown in FIG. 2, an injection jig 21 is attached to the injection port 11 provided in the coupler 7. Next, the injection port 1 is inserted through the nozzle insertion hole 23 of the injection jig 21.
The injection nozzle 22 is inserted in 1, and the cooling liquid 12 is injected into the cooling chamber R by operating the injection pump (not shown) connected to the injection nozzle 22 as shown in FIG. 3A. In this case, the injection amount of the cooling liquid 12 is set to be slightly larger than the required amount.

Further, when the liquid surface of the cooling liquid 12 reaches the vicinity of the injection port (in the vicinity of the one-dot chain line P in FIG. 3A), the injection pump is operated to slightly reduce the injection speed of the cooling liquid 12 and the suction port. Air suction is started from 27.

After that, when the liquid surface of the cooling liquid 12 completely reaches the upper portion of the injection port 11, the suction from the suction port 27 causes
The cooling liquid 12 overflowing from the inlet 11 is removed. That is, as shown in FIG. 4, when air is sucked in through the suction port 27 through the suction pipe 29, the cooling liquid 12 overflowing from the injection port 11 is discharged into the hole 24 of the jig body 21 and the suction port 27.
Is sucked up through and sucked out through the suction pipe 29. In this case, the outside air 30 is sucked from the slit 26 located near the inlet 11, and the cooling liquid 12 is efficiently sucked and removed by the pumping action of the air 30.

When the cooling liquid 12 starts to be sucked by the above-mentioned action, the injection nozzle 22 is gradually raised as shown in FIG. 3B, and the injection nozzle 22 is pulled out from the cooling liquid 12. In this case, the injection pump is stopped when the tip of the injection nozzle 22 goes out of the injection port 11, that is, the liquid surface, and the suction from the suction port 27 is stopped after the injection pump is completely stopped.

After the suction is stopped, the injection nozzle 22 and the injection jig 20 are removed. Further, as shown in FIG. 3C, the injection port 11 is sealed with a sealing screw 14 by a conventional method. This completes the injection work of the cooling liquid 12.

According to the method of this embodiment described above, fine adjustment for preventing bubbles from being mixed in the cooling liquid 12 is unnecessary, and the efficiency of the injection work can be greatly improved. Also, since such fine adjustment is unnecessary,
It is also possible to automate the injection work.

By the way, when the injection work is automatically performed, for example, the following configuration is adopted. That is, first, the injection jig 20 and the injection nozzle 2 are made by an air cylinder or the like.
2 is installed near the inlet 11, and the injection pump is driven to inject the cooling liquid 12. Then, when the preset time has elapsed, the suction pump is operated to perform the above-mentioned suction work. Then, after a predetermined time has elapsed, the injection and suction operations are stopped, and the injection nozzle 22 and the injection jig 20 are removed by an air cylinder or the like. Finally, the sealing screw 14
The injection port 11 is sealed by. In the liquid-cooled cathode ray tube manufactured in this manner, the cooling liquid 12 is filled up to the injection port 11 and no bubbles remain in the cooling liquid 12, so that good image quality is obtained.

FIG. 8 shows the essential parts of another embodiment of the present invention. In the following, the parts corresponding to those of the above-mentioned embodiment are designated by the same reference numerals.

In this embodiment, a packing 30 is provided in the jig body 21 so as to be in contact with the injection nozzle 22, and a packing 31 is also provided at a portion in contact with the coupler 7.
Is provided. With this configuration, the inside of the injection jig 20 is kept airtight.

In the case of this embodiment, when air is sucked from the suction port 27, the pressure in the cooling chamber R is lowered, and by this action, the cooling liquid 12 can be injected without using an injection pump. The configuration can be simplified.

The present embodiment is effective for a liquid-cooled cathode ray tube which does not have a pressure adjusting mechanism (for example, a valve) in the cooling chamber R. Other configurations and operations are the same as those of the above-described embodiment, and thus detailed description thereof will be omitted.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made. For example, the shape and size of the jig body can be arbitrary according to the size of the injection port, and the size and number of slits can be set to the injection speed, the suction speed, the diameter of the injection nozzle, or the like. It can be changed according to.

The present invention is applicable not only to liquid-cooled cathode ray tubes but also to the injection of various liquids.

[0032]

As described above, according to the liquid injection method of the present invention, the liquid is made to overflow from the injection port and the overflowed liquid is sucked and removed. Fine adjustment for preventing bubbles from being mixed into the liquid becomes unnecessary, and as a result, the efficiency of the injection work can be greatly improved. Then, according to the present invention, it becomes possible to automate the injection work. According to the liquid pouring jig of the present invention, the liquid pouring method of the present invention can be easily implemented, automation of work can be achieved, and the efficiency thereof can be significantly improved. According to the method for manufacturing a liquid-cooled cathode ray tube according to the present invention, it is possible to inject and seal a cooling liquid in a bubble-free state with good workability, and to obtain a reliable liquid-cooled cathode wire with good image quality. The tube can be manufactured efficiently.

[Brief description of drawings]

FIG. 1A is a diagram of an embodiment of a liquid injection jig according to the present invention.
It is the aa sectional view taken on the line in B. B is a bottom view of the embodiment.

FIG. 2 is a cross-sectional view showing a state where the same embodiment is attached to a liquid cooling section.

FIG. 3 is a cross-sectional explanatory view showing an embodiment of a liquid injection method according to the present invention.

FIG. 4 is a cross-sectional explanatory view showing a suction state of a cooling liquid in the embodiment.

FIG. 5 is a cross-sectional view showing a main part of a liquid-cooled cathode ray tube to which the present invention is applied.

FIG. 6 is a cross-sectional view showing a liquid cooling part of a liquid cooling type cathode ray tube to which the present invention is applied.

FIG. 7 is a sectional view showing an overall configuration of a liquid-cooled cathode ray tube to which the present invention is applied.

FIG. 8 is a sectional view showing another embodiment of the liquid injection jig according to the present invention.

FIG. 9 is a cross-sectional view showing a liquid cooling part of a typical liquid cooling type cathode ray tube.

FIG. 10 is an explanatory cross-sectional view showing a conventional cooling liquid injection method.

[Explanation of symbols]

1 panel 7 coupler 9 final lens 11 Inlet 12 Coolant 20 Injection jig 21 Jig body 22 injection nozzle 23 Nozzle insertion hole 24 holes 25 Projection 26 slits 27 Suction port R cooling room

Claims (4)

(57) [Claims] 1. A pouring device which is inserted into an injection port and is movable in a room
Injecting a liquid into the chamber through an inlet nozzle, and the chamber
The process of sucking and exhausting the residual air in the
The process of flooding the body and suction removal of this overflowing liquid
And withdrawing the injection nozzle from the liquid,
A method for injecting liquid, comprising a step of hermetically sealing the inlet. 2. A nozzle insertion hole for movably inserting an injection nozzle into a liquid injection port, a suction port connected to the nozzle insertion hole for sucking the liquid overflowing from the injection port, A liquid injection jig, which is connected to a nozzle insertion hole and has an air port for sucking air from the vicinity of the injection port. 3. An empty space filled with a cooling liquid for a liquid-cooled cathode ray tube.
While filling the cooling liquid through the inlet,
Residual air in the space is suctioned and exhausted, and then from the inlet
After removing the overflowed cooling liquid by suction,
Liquid cooled cathode characterized by hermetically sealing the inlet
Method of manufacturing a wire tube. 4. A panel front face, a coupler and a final lens surround the panel.
Inserted in the cooling liquid inlet provided in the enclosed space,
Into the space through an injection nozzle that is movable between
Injecting cooling liquid and sucking residual air in the above space
The process of exhausting and overflowing the cooling liquid from the inlet
And the suction process to remove the overflowing cooling liquid.
Withdrawing the injection nozzle from the cooling liquid;
Characterized by having a step of hermetically sealing the inlet
Liquid-cooled cathode ray tube manufacturing method.