JP3213018B2 - Cathode ray tube device - Google Patents

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 device, and more particularly to a cathode ray tube device having a cathode ray tube having an exterior component such as a deflection yoke mounted inside an exterior box such as a magnetic shield case. .

[0002]

2. Description of the Related Art Generally, a vibration generated from a moving body is applied to a cathode ray tube installed on a moving body such as an aircraft, a ship or a vehicle. When vibration is applied to the cathode ray tube, the vibration is transmitted to various members in the tube arranged inside the cathode ray tube, causing resonance and causing adverse effects such as deterioration of an image drawn on the phosphor screen.

[0003] For example, in a shadow mask type color picture tube, a shadow mask as a color selection electrode is disposed opposite a phosphor screen formed of a three-color phosphor layer formed on the inner surface of the panel. When the mask vibrates, the area of the electron beam passing through the electron beam passage hole and impinging on the three-color phosphor layer changes, and when the vibration is large, it impinges on the other color phosphor layer and causes color shift. Awaken. The image drawn on the phosphor screen is obtained by scanning the electron beam horizontally and vertically at a constant repetition frequency by the deflection action of the deflection yoke. When a specific relationship is established with the repetition frequency, bright and dark stripes and stripe patterns having different colors are generated on the screen.

Further, in the above-mentioned moving body, generally, the cathode ray tube is often arranged close to other electric equipment, so that it is not only affected by the leakage magnetic field generated from the nearby electric equipment, but also constantly. , The influence of the geomagnetism changes, and the characteristics tend to change.

Therefore, when a display device using a cathode ray tube is mounted on a moving body accompanied by vibration, the cathode ray tube itself is designed to be vibration-proof, and the display device is sufficiently floated from the moving body so that the cathode ray tube is hardly vibrated. It is necessary to prevent transmission, and to prevent the influence of geomagnetic changes due to the leakage magnetic field from nearby electric equipment and changes in the attitude of the moving body, and to maintain the predetermined characteristics at all times, the magnetic shielding effect It is also necessary to store in an exterior box with
Therefore, a display device using a cathode ray tube mounted on a moving body conventionally has a structure in which a filling member having an elastic vibration isolating effect is interposed in an outer box having a magnetic shielding effect by a so-called potting method to hold the cathode ray tube. Is formed.

As the filling member to be interposed by the above-mentioned potting method, a material having a vibration / shock absorption characteristic adapted to the strength and mode of vibration and shock is selected so as to minimize the vibration and shock received by the cathode ray tube. used.

FIG. 6 shows a cathode ray tube device holding a color picture tube with a filling member interposed by the potting method. In this cathode ray tube device, a cathode ray tube 1 (color picture tube) has a phosphor screen 2 formed of a three-color phosphor layer on the inner surface, and a shadow mask 3 inside the phosphor screen 2 opposite to the phosphor screen 2. Panel 4 arranged,
Funnel-shaped funnel 5 integrally joined to panel 4
And a tube comprising a neck 8 connected to the funnel 5 and having an electron gun 7 disposed inside. A deflection yoke 9 is provided outside the boundary between the funnel 5 and the neck 8, and External components such as a static convergence and a color purity adjusting magnet 10 are mounted on the outside. The cathode ray tube 1 is filled by a filling member 11 made of silicone rubber from the skirt portion of the panel 4 to the funnel 5 on which the deflection yoke 9 is mounted by a potting method.
Vibration received from the moving body and held in the outer box 12 is attenuated by the filled filling member 11 to reduce the vibration applied to the cathode ray tube 1. In addition, a filter glass 13 is attached to the front end of the outer box 12 so as to oppose the panel 4 and prevent a decrease in contrast of an image drawn on the phosphor screen 2 due to external light.

In the cathode ray tube device of this structure, in order to increase the vibration absorbing effect of the filling member 11 and reduce the vibration applied to the cathode ray tube 1, the distance between the cathode ray tube 1 and the outer box 12 must be as large as possible. Then, it is desired to increase the thickness of the filling member 11 to be filled. However, in general, the operating room, engine room, and the like of a moving body in which the cathode ray tube device is installed have a small space, and accordingly, the size of the cathode ray tube device is limited. On the other hand, there is a demand to make the display screen of the cathode ray tube device as large as possible. Therefore, the thickness of the filling member 11 to be actually filled is a trade-off between the size of the outer box 12 which is limited in terms of space and the required screen size, and generally cannot be made too thick.

By the way, when the cathode ray tube device having the above structure is mounted on a moving body, the temperature around the cathode ray tube device is 90 ° C. due to heat from nearby electric equipment or direct sunlight received by the moving body. To some extent. When the heat of the deflection yoke 9 attached to the cathode ray tube 1 (approximately 40 ° C.) is added to this, the temperature in the outer box 12 becomes 100 ° C.
That is all. As a result, the filling member 11 thermally expands, and the cathode ray tube 1 held by the filling member 11 moves the tube axis (Z
Approximately 2 mm is pushed forward in the axial direction.

More specifically, referring to FIG. 7, which is an enlarged view of a part of the cathode ray tube device, the cathode ray tube 1 and the outer casing are described.
Filling member 11 filled in a portion having a relatively large distance from 12
Has a thickness of about 40 mm in the direction 15 perpendicular to the tube axis and about 85 mm in the same direction 16 as the tube axis. On the other hand, when silicone rubber is used as the filling member 11, its thermal expansion coefficient is 2 ×
10 ^-4 / ° C. is because, the thermal expansion of the filling member 11 in the direction 15 perpendicular to the tube axis of the room temperature when the temperature rises from (20 ° C.) to 90 ° C. (temperature difference [Delta] T = 70 ° C.) is, 40 mm × 70 ° C × 2 × 10 ⁻⁴ / ° C. = about 0.6 mm Similarly, the thermal expansion in the same direction 16 as the tube axis is 85 mm × 70 ° C. × 2 × 10 ⁻⁴ / ° C. = about 1.2 mm. As a result, the funnel 5 inclined with respect to the pipe axis 5
Moves to the point B where they are combined.

Assuming that the heating of the filling member 11 is uniform, the thermal expansion of the filling member 11 becomes symmetric with respect to the tube axis, and the cathode ray tube 1 moves forward in the tube axis direction as shown by the broken line. , A are extruded to point C. The distance LAC is A
Assuming that the length between −B is LAB, the angle ACB is θ ₁ , and the angle between the line AB and the perpendicular 17 of the outer surface of the funnel 5 is θ ₂ ,

[0012]

(Equation 1)

## EQU1 ##

Now, if θ ₁ = 25 °,

[0015]

(Equation 2)

## EQU1 ## From equation (1),

[0017]

(Equation 3)

Thus, the cathode ray tube 1 is extruded by 2.5 mm. As a result, there is a problem that the panel 4 hits the filter glass 13 attached to the front surface and breaks it.

The cathode ray tube 1 due to the thermal expansion of the filling member 11
Japanese Utility Model Application Laid-open No. 58-3728
No. 0 discloses an outer box 12 and a filling member as shown in FIG.
There is shown a cathode ray tube device in which a porous member 20 is arranged between the cathode member 11 and the porous member 20 to absorb the thermal expansion of the filling member 11. However, in this structure, the filling member 11
When the silicone rubber is filled with a suitable material, there is a problem that the uncured flowable silicone rubber penetrates into the porous member 20 and loses the absorbing effect of the filling member 11 on the thermal expansion.

In Japanese Utility Model Laid-Open No. 57-17053,
A cathode ray tube device having a structure in which a space 21 is provided in a part of the filling member 11 and serves as an escape space when the filling member 11 thermally expands is shown. However, in this structure, since the filling member 11 is filled up to the funnel 5 portion of the cathode ray tube 1 which is most affected by the thermal expansion of the filling member 11, it is difficult to obtain a sufficient effect. In addition, in this structure, since the deflection yoke 9 is also covered with the filling member 11, the heat generated by the deflection yoke 9 increases the temperature in the vicinity thereof to 100 ° C. or more, and the thermal expansion of the filling member 11 heated to this high temperature. As a result, the deflection yoke 9 is deformed, and the convergence and color purity of the color picture tube deteriorate.

[0021]

As described above, in a display device mounted on a moving body in the related art, in order to reduce the vibration received from the moving body, the cathode ray tube is interposed through a filling member having an elastic vibration-proof function. It is formed in a structure to be held inside the outer box. However, in the conventional cathode ray tube device, since the filling member is filled up to the funnel-shaped funnel portion of the cathode ray tube, when the filling member thermally expands, the cathode ray tube is pushed forward in the tube axis direction to face the panel. There is a problem in that it hits the filter glass attached to the front surface and breaks it.

To prevent this, there is a structure in which a porous member is arranged between the outer box and the filling member to absorb the thermal expansion of the filling member. When the silicone rubber is filled, there is a problem that the uncured flowable silicone rubber permeates into the porous member, and the absorbing effect of the filling member on thermal expansion is lost. There is also a structure in which a space is provided in a part of the filling member to provide an escape space when the filling member thermally expands. However, in this structure, the funnel portion of the cathode ray tube which is most affected by the thermal expansion of the filling member is filled. Since the members are filled, it is difficult to obtain a sufficient effect. In addition, since the deflection yoke is covered with the filling member, the heat of the deflection yoke heats the nearby filling member to a high temperature, and the deflection yoke is deformed by the thermal expansion of the filling member heated to the high temperature, and the collar is deformed. There is a problem that convergence and color purity of the picture tube deteriorate.

The present invention has been made to solve the above problems, and constitutes a cathode ray tube device which reduces the extrusion of the cathode ray tube due to the thermal expansion of the filling member and which does not particularly deteriorate the characteristics of the cathode ray tube. The purpose is to:

[0024]

A cathode ray tube having a panel, a funnel-shaped funnel joined to the panel, and a tube connected to the funnel and a neck ,
In a cathode ray tube device comprising an exterior component including a deflection yoke mounted on the outside of the tube and the cathode ray tube in an exterior box via a filling member, the filling member is a tube of the cathode ray tube.
The deflection yoke is filled at two or more locations separated in the axial direction.
Is the non-filling between the two or more filling members
It was formed in the structure arranged in the part .

[0025]

As described above, outside the funnel and the deflection yoke.
The surrounding space is a space, and the space is separated in the tube axis direction of the cathode ray tube.
When the filling member is filled at more than two positions, even if the filling member thermally expands, the filling member swells into a space where the filling member is not filled, and pushes the cathode ray tube forward in the tube axis direction. Filling material can be greatly reduced
Because the effect of thermal expansion of the
In addition, the displacement of the deflection yoke and the change of swing can be suppressed.
Therefore, it is possible to prevent color shift and fluctuation of convergence.
it can.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings based on embodiments.

FIG. 1 shows a cathode ray tube device according to one embodiment. In this cathode-ray tube apparatus, the cathode ray tube 1 is a color picture tube, the panel 4 and the panel 4 a tube made of a neck 8 which is provided continuously to the funnel 5 and the funnel 5 of the shaped funnel integrally joined to A phosphor screen 2 formed of a three-color phosphor layer emitting blue, green, and red light is formed on the inner surface of the panel 4, and a large number of electron beam passage holes are formed inside the phosphor screen 2 in opposition to the phosphor screen 2. The formed shadow mask 3 is arranged. An electron gun 7 for emitting three electron beams is provided in the neck 8.

The funnel 5 and the neck 8 of the cathode ray tube 1
A deflection yoke 9 is provided outside the boundary between the magnets and a magnet 10 for static convergence and color purity adjustment is provided outside the neck 8.
Is installed.

The deflection yoke 9 and the magnet 10
Is mounted inside an outer box 30, and the cathode ray tube 1 mounted with the deflection yoke 9 and the magnet 10 is mounted on the outer box 30 with a funnel 5, a deflection yoke 9 and a magnet. The space filled near the outer surface of the skirt of panel 4 is about 30 mm and the hardness is 2
A filling member 31a made of silicone rubber having a hardness of 0 to 40 (hardness according to the measuring method described in JIS. K-6301) and a width of about 30 mm filled near the end of the neck 8 and a hardness of 30 to 30
50 (hardness according to the measuring method described in JIS. K-6301) and a filling member 31b made of silicone rubber. That is, since the center of gravity of the cathode ray tube 1 on which the deflection yoke 9 and the magnet 10 are mounted is located in the funnel 5, the filling members 31a and 31b are located at the center of gravity of the cathode ray tube 1 on which the deflection yoke 9 and the magnet 10 are mounted. It is structured to hold on both sides of the position.

A filter glass 13 is attached to the front end of the outer box 30 facing the panel 4 of the cathode ray tube 1, and openings 32a to 32d are formed avoiding the filling positions of the filling members 31a and 31b. Have been.

Next, a method of assembling the cathode ray tube device will be described.

As shown in FIG. 3A, the cathode ray tube 1 manufactured by a predetermined color picture tube manufacturing process is placed on a jig table 34 with the panel 4 facing down.
And fix the contact portion between the outer box 30 and the jig stand 34 in a liquid-tight manner. Further, an opening (not shown) formed in the outer box 30 is sealed by an arbitrary means such as an adhesive tape. In order to form the filling member 31a at a predetermined position near the outer surface of the skirt portion of the panel 4, the filling member 31a is formed.
An inert liquid having a specific gravity larger than 31a, such as Fluorinert 35a, is injected until a predetermined width is reached. Then, as shown in (b), the uncured flowable silicone rubber 36a
Inject and harden to a volume of 0 mm.

Next, as shown in FIG.
In order to make the space 5 and the vicinity of the deflection yoke (not shown) into a space, the second layer Florinert 35b is injected until the neck 8 is almost buried. Then, as shown in (d), the uncured flowable silicone rubber 36b is injected in an amount of about 30 mm in width and cured. After that, while discharging the florinate 35a from a discharge portion (not shown) provided on the jig table 34, the adhesive tape sealing the opening of the outer box 30 is peeled off, and the florinate 35b is removed from the opening. Discharge. After that, a filter glass is attached to the front surface of the panel 4.

When the cathode ray tube device is constructed as described above, even if the filling members 31a and 31b are thermally expanded due to a rise in temperature around the cathode ray tube device, the cathode ray tube 1 can be pushed out to the front side in the tube axis direction. A cathode ray tube device can be provided which can greatly reduce the deflection yoke 9 and does not deform the deflection yoke 9 and effectively suppresses external vibration applied to the cathode ray tube.

That is, with the above configuration, even if the filling members 31a and 31b are thermally expanded due to an increase in the ambient temperature of the cathode ray tube, the resulting force for pressing the cathode ray tube 1 does not affect the skirt portion and the neck of the panel 4. 8 and the outer surfaces of the skirt portion and the neck 8 are substantially parallel to the tube axis, so that the tube axial component of the pressing force applied to the cathode ray tube 1 by the thermally expanded filling members 31a and 31b is extremely small. . Therefore, the extrusion of the cathode ray tube 1 to the front side in the tube axis direction can be greatly reduced, and the breakage of the filter glass 18 caused by the conventional large extrusion to the front side in the tube axis direction can be prevented.

FIG. 2 is a characteristic diagram showing the extrusion of the cathode ray tube device of this embodiment to the front in the tube axis direction in comparison with that of the conventional cathode ray tube device. In this figure, the horizontal axis represents time (heating time), the extrusion amount of the cathode ray tube and the vertical axis on the left side is shown I city the temperature of the filling member to the longitudinal axis of the right side. In the figure, when the temperature of the filling member rises as shown by the broken line 38 (90 ° C.), the conventional cathode ray tube device extrudes 2 mm or more as shown by the curve 39. As shown by the curve 40, the amount is small, and the extrusion toward the front in the axial direction of the tube is greatly reduced as compared with the conventional cathode ray tube device.

In addition, the cathode ray tube device of this embodiment is
Since the openings 32a to 32d are formed in the opening 30, heat generated from the deflection yoke 9 and the like during operation of the cathode ray tube 1 is transmitted to the openings 3a to 32d.
2a to 32d can be diffused to the outside to prevent thermal expansion due to excessive heating of the filling members 31a and 31b. That is, the openings 32a to 32d provided in the outer box 30 are used for assembling the cathode ray tube device, after the fluid silicone rubbers 36a and 36b are cured.
It is used as a discharge hole for discharging the florinates 35a and 35b. After the cathode ray tube device is assembled, the openings 32a to 3d are formed.
Due to convection of air passing through 2d, excessive heating of the filling members 31a, 31b due to heat generated from the deflection yoke 9 and the like is suppressed, and thermal expansion of the filling members 31a, 31b is prevented. According to the measurement results, the temperature near the deflection yoke was about 40 ° C. in the case of using the outer box having no openings, but the formation of the openings 32 a to 32 d enabled the temperature to be suppressed to about 30 ° C. Was. In order to make the effects of the openings 32a to 32d effective, the openings 32a to 32d may be provided in a vertical pair so as to improve the convection of air.

The cathode ray tube device of this example has a panel 4
Filling members 31a and 31b are filled near the outer surface of the skirt portion and near the end of the neck 8, respectively.
Unfilling between the filling members 31a and 31b so that the enclosure is a space
Even if the filling members 31a and 31b are thermally expanded, the deflection yoke 9 is not deformed,
Therefore convergence and color purity deterioration due to the deformation of the deflection yoke that occurred in the conventional cathode-ray tube apparatus can be prevented.

Further, in the cathode ray tube apparatus of this embodiment, the vicinity of the outer surface of the skirt portion of the panel 4 and the end of the neck 8 are sandwiched by the center of gravity of the cathode ray tube on which the deflection yoke 9, static convergence and the color purity adjusting magnet 10 are mounted. Since the filling members 31a and 31b are filled in the vicinity of the portions, respectively, the vibration applied to the cathode ray tube is effectively attenuated.

That is, according to the experimental results of the inventor, when the cathode ray tube is held near the position of the center of gravity of the cathode ray tube on which the deflection yoke 9 and the magnet 10 are mounted, the vibration transmission damping characteristic is filled near the position of the center of gravity. Greatly depends on the filling member. Therefore, it has been found that even if a material having excellent attenuation characteristics is used, the characteristics cannot be sufficiently exhibited. FIG.
This is shown. In FIG. 4, curve 42
Is the amplitude magnification of the conventional cathode ray tube device in which the filling member is filled to near the center of gravity. On the other hand, when the filling member of the two kinds of hard and soft is filled to near the position of the center of gravity, the amplitude magnification is reduced as shown by the curve 43. When the filling member is filled, the amplitude magnification can be reduced as shown by the curve 44.

In the cathode ray tube device of this embodiment, the hardness of the filling members 31a and 31b is set to 20 to 40 for the filling member 31a near the outer surface of the skirt portion of the panel 4, and the filling member near the end of the neck 8 is set. For 31b, hardness 30-50
However, this was optimized as a result of experiments on a plurality of types of filling members having different hardnesses.

That is, in the cathode ray tube 1 (color picture tube) of the cathode ray tube device of this embodiment, the shadow mask 3 is disposed inside the panel 4 and the resonance frequency of the shadow mask 3 is 200 to 500 Hz. It is desired that the filling member 31a which approaches the shadow mask 3 and holds the cathode ray tube 1 effectively attenuates vibrations of 200 Hz or more. It is effective that the filling member 31a satisfying the above condition has a hardness of 40 or less. On the other hand, if the hardness is less than 20, the holding of the cathode ray tube 1 becomes unstable. The hardness of the member 31a was set to 20 to 40.

[0043] The resonant frequency of the electron gun 7 is arranged in the neck 8 is 400～600Hz, higher than the resonance frequency of the shadow mask 3. Therefore, neck 8
The filling member 31b near the end was made harder than the filling member 31a near the outer surface of the skirt portion of the panel 4, and had a hardness of 30 to 50 to obtain vibration attenuation and stable holding of the cathode ray tube 1.

In the above embodiment, the cathode ray tube is held by filling the filling member at two places near the outer surface of the skirt portion and near the end of the neck of the panel. As shown in FIG. 5, a filling member 31 is provided between the vicinity of the outer surface of the skirt portion of the panel 4 and the vicinity of the end of the neck 8 as appropriate.
Almost the same effects can be obtained by holding at three or more places, such as filling with c.

[0045]

As described above, a cathode ray tube having a tube composed of a panel, a funnel-shaped funnel and a neck, an exterior component such as a deflection yoke mounted outside the tube, and the cathode ray tube
In a cathode ray tube device in which the filling member is held in an outer box via a filling member, the filling member is separated in the tube axis direction of the cathode ray tube.
Filled in two or more places between them, and provided two or more deflection yokes
In the non-filling part between the filling members filled in
More, even if thermal expansion filling member by increasing the ambient temperature of the cathode ray tube, the cathode ray tube to greatly reduce the to act extruded tube axis forward, and the deterioration of the cathode ray tube of characteristics due to the deformation of the deflection yoke Can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a cathode ray tube device according to one embodiment of the present invention.

FIG. 2 is a view showing that a cathode ray tube is pushed forward by a thermal expansion of a filling member in a tube axis direction in comparison with that of a conventional cathode ray tube device.

[3] FIGS. 3 (a) to (d) are diagrams for respectively explaining a method of assembling the cathode-ray tube apparatus.

FIG. 4 is a diagram showing an amplitude magnification with respect to an applied vibration frequency of the cathode ray tube device in comparison with that of a conventional cathode ray tube device.

FIG. 5 is a diagram showing a configuration of another embodiment.

FIG. 6 is a diagram showing a configuration of a conventional cathode ray tube device.

FIG. 7 is a view for explaining pushing of a cathode ray tube forward in a tube axis direction due to thermal expansion of a filling member in a conventional cathode ray tube device.

FIG. 8 is a diagram showing a configuration of a conventional improved cathode ray tube device.

FIG. 9 is a view showing a configuration of a further improved conventional cathode ray tube device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cathode tube 2 ... Phosphor screen 3 ... Shadow mask 4 ... Panel 5 ... Funnel 7 ... Electron gun 8 ... Neck 9 ... Deflecting yoke 10 ... Magnet for adjusting static convergence and color purity 13 ... Filter glass 30 ... Outer box 31a 31b, 31c: filling member 32a to 32d: opening

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Takekawa 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Pref. Toshiba Electronic Engineering Co., Ltd. (56) References Real Opening Sho 58-58 (377) Field (Int.Cl. ⁷ , DB name) H01J 29/86 H04N 5/645

Claims (1)

(57) [Claims] 1. A panel and exterior comprising a cathode ray tube having a composed tube from the funnel-shaped funnel and continuously provided by the neck to the funnel joined to the panel, the deflection yoke mounted on the outside of the tube In a cathode ray tube device in which a part and the tube are held in an outer box via a filling member , the filling member is spaced apart in a tube axis direction of the cathode ray tube.
The deflection yoke is filled at two or more locations.
A cathode ray tube device, wherein the cathode ray tube device is arranged in a non-filling portion between filling members filled above .