JPH047555Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a liquid-cooled cathode ray tube device, and more specifically, a lens structure is disposed on the face of the cathode ray tube via a frame-shaped radiator filled with coolant liquid. This invention relates to a liquid-cooled cathode ray tube device.

2. Description of the Related Art A conventional liquid-cooled cathode ray tube device known as a cathode ray tube for project use is shown in FIG. 4 and will be described below.

In the drawings, reference numeral 1 denotes a cathode ray tube, in which a fluorescent film 3 and a metal back layer 4 are laminated on the inner surface of the face 2a of a bulb 2. Reference numeral 5 denotes a condensing lens at the rear end of the lens structure disposed in front of the face 2a, and the condensing lens 5 is made of plastic, which is cheaper than glass. Reference numeral 6 denotes a frame-shaped radiator made of aluminum with good heat dissipation interposed between the face 2a and the condensing lens 5, and is airtightly fixed to the face 2a with a resin adhesive 7 such as silicone rubber. . Reference numeral 8 denotes a transparent coolant such as ethylene glycol that is filled in a space surrounded by the face 2a, the radiator 6, and the condenser lens 5. The coolant 8 is filled through an opening at the upper end of the outer periphery of the radiator 6. Drilled through hole 9
This is done by supplying from Reference numeral 10 denotes an elastically deformable cushion valve made of silicone rubber or the like, and as shown in FIG. The flange portion 12 is formed by extending and bending the flange portion 12 outward. The volume of the cushion valve 10 is greater than or equal to the amount of thermal expansion of the coolant 8 in the operating temperature range during operation of the cathode ray tube, for example, from 20° C. to 60° C., and is, for example, about 2 to 3 times the amount of thermal expansion mentioned above. . The cushion valve 10 is fitted into the through hole 9 of the radiator 6 which has a buffer space m above the coolant 8.
The flange portion 12 of the through hole 9 is positioned by being engaged with a stepped portion 13 provided at the upper end opening 9a of the through hole 9. In this state, a lid 15 having a ventilation hole 14 formed therethrough is further fitted into the upper end opening 9a of the through hole 9 and fixed with screws or the like. This cushion valve 10 partitions the cooling liquid 8 from the buffer space m of the through hole 9 to ensure sealing performance. Reference numeral 16 denotes a ring-shaped gasket made of resin, which is arranged at the front opening of the radiator 6 to maintain airtightness between it and the condenser lens 5. 1
Reference numeral 7 denotes a holding member which is screwed onto the front surface of the radiator 6 while being fitted onto the condensing lens 5 to fix and hold the condensing lens 5 in the front opening of the radiator 6.

During operation of the cathode ray tube 1, the heat generated at the face 2a of the valve 2 is transferred to the radiator 6 by the convection action of the cooling liquid 8, and then radiated to the outside from the outer surface of the radiator 6. The temperature rise of the face 2a is suppressed. At this time, the cooling liquid 8 itself thermally expands, but this thermal expansion is absorbed by the cushion valve 10. That is, due to the thermal expansion of the cooling liquid 8, the side wall of the main body 11 of the cushion valve 10 is pressed inward and elastically deformed as shown by the two-dot chain line in FIG. Since the interior of the cushion valve 10 is open to the atmosphere through the vent hole 14 of the lid 15, the above-described elastic deformation of the cushion valve 10 occurs quickly.

Problems to be Solved by the Invention The conventional liquid-cooled cathode ray tube device described above has the following problems.

In the liquid-cooled cathode ray tube device, after the cooling liquid 8 is filled into the radiator 6 through the through hole 9, the cushion valve 10 is fitted into the through hole 9, and the through hole 9 is filled with the cooling liquid 8.
Since the cushion valve 10 is fixed by fitting the lid 15 on the upper end and fixing it with screws, the cooling liquid 8 can be injected in an accurate specified amount and the radiator can be installed and fixed after the cushion valve 10 is installed and fixed. Although it is necessary to prevent air from remaining in the coolant 6, it is difficult to inject the specified amount accurately as described above, and the current situation is that the amount of the coolant 8 injected varies.

By the way, if the amount of the cooling liquid 8 is larger than the specified amount, it will overflow when the cushion valve 10 is inserted into the through hole 9, causing damage to the cushion valve 10 and the lid 15.
If the cushion valve 10 is fixed to the radiator 6 while the coolant 8 is lower than the specified amount and air remains, the cathode ray tube device may not be transported. During handling or handling, this air moves as bubbles into the radiator and adheres to the surface of the face 2a and the condensing lens 5, potentially causing a significant deterioration in image quality.

Means for Solving the Problems The present invention was made in view of the above problems, and includes airtightly disposing a lens structure in front of the face of a cathode ray tube via a frame-shaped radiator filled with cooling liquid. An elastically deformable individual cylindrical cushion valve having a volume greater than the volume in which the cooling fluid expands during operation is arranged in a through hole formed in the upper part of the radiator, with the valve opening to the outside of the radiator. In the liquid-cooled cathode ray tube device in which a buffer space is formed above the cooling liquid, a groove extending upward from the bottom is formed in the cushion valve, and a liquid cooling inlet of the radiator is placed at a position corresponding to the upper end of the groove. This is a liquid-cooled cathode ray tube device with an inlet.

Function The liquid-cooled cathode ray tube device according to the present invention is configured such that after the cushion valve is fixed, the cooling liquid is injected into the radiator from the injection port formed in the radiator through the groove of the cushion valve. It is possible to reliably fill only the cooling liquid without leaving any air remaining.

Embodiment FIGS. 1 to 3 show an embodiment of a liquid-cooled cathode ray tube device according to the present invention, and the same or corresponding parts as in FIGS. 4 and 5 are given the same reference numerals. The explanation will be omitted.

The liquid-cooled cathode ray tube device according to the present invention includes a cushion valve 20 in which a groove 23 extending upward from the bottom is formed in the main body 21, and a groove 23 corresponding to the upper end of the groove 23 of the cushion valve 20 in the radiator 6. It is characterized by a coolant inlet 30 provided at a position, and will be described in detail below.

In this embodiment, as shown in FIG. 2, the cushion valve 20 has a bifurcated shape in which a depth groove 23 extending upward from the bottom is formed in the center portion of the main body 21 in the width direction. As described above, it has a flange portion 22 formed by extending the upper end opening portion of the main body portion 21 and bending it outward. The cushion valve 20 is made of silicone rubber or the like and is elastically deformable, and the volume of the cushion valve 20 is determined by the operating temperature range during cathode ray tube operation.
For example, it is more than the amount of thermal expansion of the cooling liquid 8 at 20° C. to 60° C., for example, about 2 to 3 times the above amount of thermal expansion. The cushion valve 20 is attached and fixed to the radiator 6 in the same way as described above, by locking the flange portion 22 to the stepped portion 13 of the upper end opening 9a of the through hole 9. upper end opening 9a of this through hole 9.
This is done by fitting the lid 15 over the top and fixing it with screws or the like.

The injection port 30 is bored in the radiator 6 so as to be perpendicular to the through hole 9, and the opening on the side of the through hole 9 is located at the upper end of the groove 23 of the cushion valve 20 installed and fixed in the through hole 9. It is in the corresponding position. As shown in FIG. 3, the injection port 30 has a threaded portion 31 formed inside thereof, and a counterbore portion 32 formed at its outer opening. Then, the injection port 30 is sealed by fitting the O-ring 33 into the counterbore portion 32 and then screwing the truss machine screw 34 into the injection port 30. In addition, by setting the depth of the counterbore 32 to be smaller than the thickness of the O-ring 33 by a predetermined ratio,
Since the squeezing margin of the O-ring 33 can be selected as appropriate, desired sealing performance can be obtained in the sealing port 30.

In the liquid-cooled cathode ray tube device having the above configuration, the cushion valve 20 is connected to the radiator 6 as described above.
The coolant 8 may be inserted into the through hole 9 and fixed with the lid 15, and the cooling liquid 8 may be injected later.

That is, after the cushion valve 20 is attached and fixed to the radiator 6, if a predetermined coolant 8 such as ethylene glycol is injected into the injection port 30, the coolant 8 flows from the injection port 30 into the cushion valve 20.
It flows into the radiator 6 through the groove 23 . If the coolant 8 is injected until the upper end of the groove 20 in the through hole 9 is filled and the inside of the injection port 30 is also filled, the groove 23 is filled with the cooling liquid 8.
Since the cooling liquid 8 is formed almost above the main body part 21 of the radiator 6, only the cooling liquid 8 can be filled without leaving air in the radiator 6 and the through holes 9 of the radiator 6.

Thereafter, by fitting the O-ring 33 into the counterbore 32 of the injection port 30 and then screwing the truss machine screw 34 into the injection port 30, the injection port 30 can be easily sealed.

That is, in the cooled cathode ray tube device according to the present invention, the through hole 9 of the radiator 6 is sealed with the cushion valve 20 and the lid 15 before the cooling liquid 8 is injected, so this sealing operation is easy. When injecting the coolant 8, if the coolant 8 is filled up to the upper end of the groove 23 of the cushion valve 20 in the through hole 9, no air remains in the radiator 6 and the through hole 9 of the radiator 6. Since it can be filled with only the coolant 8 without having to do so, it completely eliminates the conventional problem of air bubbles adhering to the surface of the face 2a and condensing lens 5 when transporting or handling the cathode ray tube device. can.

In addition, in the above embodiment, the cushion valve 2
The groove 23 of No. 0 extends in the depth direction upward from the bottom in the approximately central portion of the main body portion 21, and forms the cushion valve 20 into a bifurcated shape. As long as the groove to be formed is formed upward from the bottom of the main body portion 21 of the cushion valve 20, it may simply be a concave groove extending in this direction.

Effects of the Invention As explained above, in the liquid-cooled cathode ray tube device according to the present invention, after the cushion valve is attached and fixed to the radiator, the air is injected into the radiator from the inlet formed in the radiator through the groove of the cushion valve. Since the cooling liquid can be injected, the above-mentioned cushion valve can be easily installed and fixed, and the above-mentioned radiator can be filled with only the cooling liquid without leaving any air remaining, which improves the image quality reliably. It is possible to completely prevent deterioration, and it is also possible to handle and transport it.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a liquid-cooled cathode ray tube device according to the present invention. FIG. 1 is an enlarged cross-sectional view of the main parts of the device, and FIG. A front view of the valve, and FIG. 3 is an enlarged sectional view of the coolant inlet portion. Figures 4 and 5
The figure shows an example of a conventional liquid-cooled cathode ray tube device.
The figure is an overall perspective view of the cushion valve in the above device. 1...Cathode ray tube, 2a...Face, 5...Condensing lens, 6...Radiator, 8...Cooling liquid, 9
...Through hole, 20...Cushion valve, 23...
...Groove, 30...Inlet, m...Buffer space.

Claims (1)

[Claim for Utility Model Registration] A lens structure is airtightly disposed in front of the face of the cathode ray tube via a frame-shaped radiator filled with a cooling liquid, and a buffer is provided to absorb the volume of the cooling liquid expanded during operation. In a liquid-cooled cathode ray tube device in which a bottomed cylindrical cushion valve having a space is airtightly arranged with an opening above and outside the radiator, a groove extending upward from the bottom is formed in the cushion valve. . A liquid-cooled cathode ray tube device, characterized in that a cooling liquid inlet for the radiator is provided at a position corresponding to the upper end of the groove.