JPS6322604Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube device, particularly to a cathode ray tube device suitable for application to a high brightness cathode ray tube used in a color projector, for example.

High-brightness cathode ray tubes increase the energy of the electron beam that impacts the phosphor screen to obtain a high-brightness reproduced optical image, but the front panel coated with phosphor, that is, the glass panel, Since the temperature is low, the temperature rises significantly at the center of the panel, where heat is difficult to dissipate, especially during continuous operation. Therefore, so-called temperature quenching is caused in the phosphor. This temperature quenching is a phenomenon in which the brightness of a phosphor decreases as the temperature rises, but since the degree of temperature quenching differs for each color of phosphor, it causes an imbalance in the white balance.

Since any deviation in white balance at the center will significantly impede image quality, it may be possible to adjust the brightness of the optical images of other colors so that the white balance can be maintained at this center during continuous operation, but in this case, , the disadvantage is that the white balance in the periphery is disrupted and the overall brightness cannot be increased.

Therefore, in order to prevent the front panel of the cathode ray tube from experiencing a temperature rise that would cause temperature quenching even during continuous operation, a cooling fan may be provided to cool the panel surface. However,
In this case, dust is sent to the panel surface as well as air is blown to the panel surface, and this dust adheres to the panel surface, causing an apparent decrease in brightness. In this case, the problem of fan noise also arises.

In order to avoid these drawbacks, it has been proposed to cool the cathode ray tube panel by disposing a transparent coolant, especially a liquid that easily generates convection, in contact with the front surface of the cathode ray tube panel.

Conventionally, this type of cathode ray tube device has a cathode ray tube body 1 with a light-transmitting, for example, transparent panel made of a glass plate or the like, facing a front panel 1a having a fluorescent screen formed on the inner surface of a cathode ray tube body 1, as shown in FIG. 2 is provided,
A ring-shaped glass spacer 3 is arranged around the periphery between the two, and this spacer 3 is liquid-tightly sealed to the front panel 1a and the transparent panel 2 with an adhesive 4.
A sealed space 5 surrounded by a spacer 3 is formed between both panels 1a and 2, and a light-transmissive, for example, transparent liquid refrigerant 6 is sealed therein.

Alternatively, as shown in FIG. 2, a transparent panel 2 and
A metal shell 7 is fitted over the panel 1a of the cathode ray tube body 1, and this shell 7 is liquid-tightly sealed to the panel 2 and the circumferential surface of the panel 1a of the tube body 1 with an adhesive 4. A sealed space 5 surrounded by a shell 7 is formed between the panels 1a and 2, and a liquid refrigerant 6 is sealed therein.

However, in any of these cases, the coolant 6, transparent panel 2,
Due to the difference in coefficient of thermal expansion of the adhesive 4, the spacer 3, the shell 7, etc., the adhesive peels, causing liquid leakage. Further, in the case where the glass spacer 3 is disposed on the circumferential surface as in the example explained in FIG. 1, there are also drawbacks such as a low heat dissipation effect.

The present invention is to provide a cathode ray tube device that eliminates the above-mentioned drawbacks, can reliably enclose liquid refrigerant, and can also effectively dissipate heat.

An example of the present invention will be explained with reference to FIG.

In the present invention, a light-transmitting transparent panel 2 made of, for example, a glass plate is arranged opposite to the front panel 1a of the cathode ray tube body 1, and the peripheral area between this panel 2 and the front panel 1a is arranged. A peripheral wall frame 7 is disposed to regulate the distance between the two and to serve as the outer peripheral wall of the liquid refrigerant sealing space. This surrounding wall frame 7
is made of a metal with excellent thermal conductivity, such as Al, or is made of resin mixed with a filler with good thermal conductivity such as metal fiber. Further, ring-shaped grooves 8a and 8b are formed on both end surfaces of the peripheral wall frame 7 facing the panels 2 and 1a, respectively.
Ring-shaped packings 9a and 9b made of silicone rubber, neoprene rubber, etc. are fitted into these grooves 8a and 8b, respectively, and these packings 9a and 9b are connected to both end surfaces of the peripheral wall frame 7 and the panels 2 and 1a. to intervene in between.

Then, a metal shell 10 extending between the transparent panel 2 and the front peripheral surface of the tube body 1 is fitted onto the outer periphery of the peripheral wall frame 7. This shell 10 is provided with a flange portion 10a that protrudes toward the axis at its front end and abuts against the peripheral portion of the front surface of the panel 2, and a flange portion 10a for fixing that is bent outward at the rear end. The fixing plate 10b made of a tongue piece is integrally constructed as a whole. Further, a ring-shaped bent portion 10c that bends inward is formed on the peripheral wall surface of this shell 10, and its inner surface is in close contact with the outer peripheral surface of the peripheral wall frame 7 over as wide an area as possible. .

Note that this shell 10 is made of a metal with good thermal conductivity, and if necessary, its surface can be treated with blackening treatment to increase the radiation coefficient and enhance the heat dissipation effect. .

On the other hand, means for fixing the shell 10 is provided on the tubular body 1 side. This fixing means may have a configuration in which, for example, a ring-shaped fixing frame 11 having an L-shaped cross section is tightened and fixed by a tightening band 12. This fixed frame 11 having an L-shaped cross section has one bent portion 11a.
is arranged along the front peripheral surface of the tubular body 1, and the band 12 is wound and fixed around the outer peripheral surface, and the other bent part 11b is arranged so as to extend outward approximately perpendicular to the axis. be done. Then, the fixing plate 10b of the shell 10 is brought into contact with this bent portion 11b and fixed with the fixing screw 13. in this case,
For example, between the head of the screw 13 and the fixing plate 10b,
The shell 10 is elastically attached to the fixed frame 11 through a spring washer 14, for example, a C-shaped or chrysanthemum-shaped washer.

In addition, the fixed frame 11 or the fixed plate 1 of the shell 10
An attachment hole for attaching the tube body 1 to a fixed part such as a chassis or a cabinet can be bored in the tube 0b, or a tongue piece having this attachment hole can be provided by welding or the like.

In this way, by fixing the shell 10 to the tube body 1, the panel 2 is elastically pressed toward the front panel 1a via the peripheral wall frame 7, and this panel 2 is pushed against the front panel 1a as required. They are held facing each other with a distance between them. In this case, packing 9a and 9 are provided between the peripheral wall frame 7 and both panels 2 and 1a.
b is pinched, and these packings 9a and 9b
As a result, the space between the peripheral wall frame 7, the transparent panel 2, and the front panel 1a is kept liquid-tight.

In this way, a liquid-tight space 5 surrounded by the peripheral wall frame 7 is formed between the panel 2 and the front panel 1a. A light-transmitting liquid refrigerant 6 is injected into the space 5 through an injection hole (not shown) formed in the peripheral wall frame 7, for example. After this injection, the injection hole mentioned above is of course closed and sealed.

In addition, the liquid refrigerant sealed in the space 5 is a liquid having a light transmittance, for example, transparency, which effectively causes convection when the temperature is raised above room temperature, i.e., a liquid with a melting point m.p.
It is desirable to use a liquid whose temperature is 0° C. or less and whose viscosity η is small. Further, it is desirable that the refrigerant is selected from those whose refractive index is close to that of the glass of the panel 1a. The liquid used as the refrigerant 6 can be a liquid that is low in toxicity, inexpensive, and easily available, such as benzyl alcohol, methyl benzoate, ethyl benzoate, diethyl oxalate, dibutal phthalate, ethylene glycone, and the like.

According to the configuration of the present invention described above, the liquid coolant 6 is provided in contact with the front surface of the panel 1a of the cathode ray tube 1, and this coolant 6 is provided with a ring-shaped peripheral wall frame having excellent thermal conductivity. 7 are provided adjacently,
Furthermore, since a shell 10 with excellent thermal conductivity is provided in contact with the surrounding wall frame 7, the heat of the panel 1a is transmitted to the surrounding wall frame 7 via the coolant 6, and a large area surrounding the shell 10 is also provided. It is dissipated to the outside by the metal shell 10. In this case, since a liquid is used as the refrigerant 6, when the temperature rises in the panel 1a, the heated refrigerant rises and convection occurs, so even if the heat in the center of the panel 1a is It can be effectively transmitted and dissipated to the surrounding area. This heat dissipation can be performed more effectively when the metal shell 10 is subjected to a treatment to increase the radiation coefficient as described above.

In particular, according to the above-mentioned configuration of the present invention, panel 1
Even if a temperature rise occurs in the refrigerant 6 as well as in the refrigerant 6 due to these temperature rises, the transparent panel 2 is elastically held by the shell 10 facing the panel 1a via the peripheral wall frame 7. Therefore, the space between the panels 2 and 1a is increased to follow the expansion of the refrigerant 6, and the thermal expansion of the peripheral wall frame 7 causes the refrigerant 6 to expand.
The volume of the space 5 is increased due to the expansion of the space 5, and since the elastic packings 9a and 9b are interposed between the peripheral wall frame 7 and both panels 2 and 1a, the packings 9a and 9b are The expansion maintains liquid tightness at all times, so there is no leakage of refrigerant.
It is possible to avoid impairing liquid tightness due to peeling, which is the case with conventional sealing using only adhesive.

It goes without saying that the shape is not limited to the above-mentioned example and can be modified in various ways. For example, the peripheral wall frame 7 is not limited to the one shown in FIG. 3, but may be modified as shown in FIG. It is also possible to have a structure in which a metal plate is bent to have a substantially convex cross section, and the opposing sides of the metal plate are further bent to form grooves 8a and 8b.

[Brief explanation of the drawing]

FIGS. 1 and 2 are side views of essential parts of conventional cathode ray tube apparatuses, each showing a part of the apparatus in cross section, and FIG. 3 shows a part of an example of a cathode ray tube apparatus according to the present invention in cross section. FIG. 4 is a cross-sectional side view of the main part of another example of the device of the present invention. 1 is a cathode ray tube body, 1a is its front panel, 2
6 is a light-transmitting panel, 6 is a liquid refrigerant, 7 is a ring-shaped peripheral wall frame, 8a and 8b are ring-shaped grooves thereof, and 9a and 9b are ring-shaped packings.

Claims (1)

[Scope of utility model registration request] A light transmitting panel is disposed opposite to the front panel of the cathode ray tube body, and a peripheral wall frame is provided along substantially the entire circumference of the peripheral portion between the front panel and the light transmitting panel, and A ring-shaped elastic packing is disposed between the peripheral wall frame, the front panel, and the light-transmitting panel to maintain a liquid-tight space therebetween, and the outer periphery of the peripheral wall frame is wrapped around the front peripheral part of the light-transmitting panel. A metal shell having an abutting flange is fitted to press and hold the front panel toward the front panel through the peripheral wall frame, and the peripheral wall frame between the light-transmitting panel and the front panel. A cathode ray tube device in which a light-transmitting coolant is sealed in a liquid-tight space surrounded by a liquid-tight space.