JP2002100284A - Drying equipment and method of facepanel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drying equipment and method of a facepanel which prevents the problem in a conventional method of occurrence of a temperature difference between a center and corners on a facepanel when drying a solvent to be dried such as a resist or the like coated on the inner surface of a facepanel for a flat type color cathode-ray tube. SOLUTION: In this drying equipment, a heat screening control apparatus 18 having a rotating fan 17 is disposed in a heat conduction path between a heat source 12 and a fixing holder 15 fastening a facepanel 51, then the heat screening control apparatus 18 and the fixing holder 15 are rotated relatively, and as a result, the temperature distribution throughout the surface of the facepanel 51 is maintained substantially constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a face panel drying apparatus and a drying method for drying a solvent to be dried such as a resist at the time of forming a fluorescent screen used in manufacturing a cathode ray tube.

[0002]

2. Description of the Related Art At present, a cathode ray tube is used as a display device such as a color television receiver or a color terminal display.
2. Description of the Related Art In recent years, display devices have been increased in size and screen size, and the flatness of the screen has also been required.

The flattened cathode ray tube will be described with reference to FIG. 5. A substantially rectangular face panel 51 made of a glass material, and a funnel made of the same glass material connected to the face panel 51 by being fused with glass. An envelope 53 is formed from a funnel 52 having a shape of a circle, and a neck 56 containing an electron gun 55 for emitting an electron beam 54 is attached to the funnel 52.

The outer surface of the face panel 51 is formed to be substantially flat, while the inner surface thereof has a substantially spherical shape, and is formed so as to be concave toward the outside. The glass material has the smallest thickness, and is formed so that the thickness of the glass material gradually increases from the central portion to the peripheral portion. This face panel 51
A phosphor screen 57 is formed by applying phosphor layers of three colors on the inner surface of the phosphor screen.

[0005] In the face panel 51 facing the phosphor screen 57, a shadow mask 58 having a curved surface substantially similar to the inner surface curve of the face panel 51 is provided. It is arranged keeping the interval. This shadow mask 58
Function as a color selection electrode, and this interval is not constant over the entire screen, but is arranged so that the interval differs depending on each position on the screen.

The shadow mask 58 is fixed and held by a frame 59 having a frame shape.
Are attached to the inner wall of the face panel 51. The frame 59 is formed in a frame shape by a magnetic material, and the height of both the long side and the short side of the frame varies depending on the location. The center of the frame on each side is the highest, and the diagonal axis is The upper corner is configured to have the lowest height.

[0007] One end of a magnetic shield plate 60 for terrestrial magnetism is fixed to the frame 59 at the end of the frame body in the direction of the electron gun 55, and the other end of the magnetic shield plate 60 extends along the inner surface of the funnel 52. Are extended in the direction of the electron gun 55.

An electron gun 55 is provided on the phosphor screen 57.
The electron beam 54 is deflected by a deflection yoke 61 mounted on the outer peripheral portion of the funnel 52 so that the electron beam 54
4 is scanned in the up, down, left, and right directions so that the phosphor screen 57
, A predetermined image is reproduced on the screen.

Further, a frame-shaped reinforcing band 62 is fitted and attached to the outer periphery of the face panel 51 by a shrink fitting method to form a color cathode ray tube 63.

In order to form the phosphor screen 57 on the inner surface of the face panel 51 of such a color cathode ray tube 63, the shadow mask 5 incorporated in the face panel 51
Photographic printing techniques with a pattern of 8 are commonly used. The phosphor screen 57 includes a shadow mask 58
Of the face panel 5 while maintaining an accurate positional relationship with the opening 64 of the
It is necessary to form the phosphor screen 57 having a stripe or dot-like phosphor layer by performing exposure from a line or point light source through a shadow mask 58.

FIG. 6 shows a general exposure apparatus used for this exposure. This exposure apparatus includes a frame 71
A panel mounting plate 73 having an opening 72 for light passage is provided on the upper end surface of the panel mounting plate 73, and a shadow mask 58 having a slot or a dot-shaped opening (64 in FIG. 5) is mounted on the panel mounting plate 73. The worn face panel 51 is positioned and placed.

A light source 74 is provided inside the frame 71.
Is arranged on a mounting table 75, and further, on the upper side of the light source unit 74, when the color cathode ray tube 63 is operated, the trajectory of the electron beam 54 due to the magnetic field of the deflection yoke 61 or the like is matched as much as possible. Correction lenses 76 and 90 for obtaining a ray trajectory with a reduced simulation error are arranged on the correction lens support bases 77 and 77 '. The correction lens 76 is a [gamma]-[Delta] P correction lens and performs a large correction according to the deflection angle, and the correction lens 90 is a [Delta] S correction lens and performs a minute correction accompanying the shift of the light source.

Further, above the correction lens 76, a correction filter 78 having a transmittance distribution for correcting the light quantity distribution of the light emitted from the light source section 74 to a desired distribution.
Are arranged on the correction filter support base 79 to constitute the exposure apparatus 80.

In order to expose the fluorescent screen of the color cathode ray tube 63 using the exposure apparatus 80 configured as described above,
First, a photosensitive resist film is applied to the inner surface of the face panel 51 and dried.

Next, a shadow mask 58 is mounted on the inside of the face panel 51 and mounted on the panel mounting table 73.
After that, for example, an ultra-high pressure mercury lamp of the light source unit 74 is caused to emit light, and the trajectories of the ultraviolet rays emitted from the light source unit 74 are corrected by the correction lenses 76 and 90, and then the correction filter 78
Then, the resist applied to the inner surface of the face panel 51 is exposed using the shadow mask 58 having a color selection function as a photomask.

Thereafter, the face panel 51 is removed, a black paint layer containing carbon as a main component is applied to the entire surface including the resist layer, and development and drying are performed. Peel off,
The portion not exposed is formed as a light absorbing layer.

Next, after applying a phosphor slurry formed by mixing any one of red, blue, and green phosphors and a photosensitive binder, a developing process is performed, and a white portion of a predetermined light absorbing layer is applied. A phosphor stripe or dot is formed. By performing this process for all colors, a phosphor screen is formed,
A stripe or dot-shaped phosphor screen 57 is formed.

A drying device as shown in FIG. 7 is used for drying the resist at the time of forming the fluorescent screen. That is, the heat source 81 composed of a panel-type temperature raising heater or the like is installed at a position facing the inner surface of the face panel 51 fixed to the rotatable fixing jig 82 so as not to cause unevenness in the temperature distribution. The fixing jig 82 for attaching the face panel 51 is configured to be rotatable perpendicularly to the axis of the direction in which heat is radiated from the heat-up heat source 81 and about the center of the inner surface of the face panel 51 as a central axis.

Factors such as the shape, size, and sharpness of the black matrix holes and the phosphor dots that affect image characteristics depend on the degree of drying of the resist when forming the phosphor screen, in other words, when the temperature of the face panel 51 rises. Temperature distribution.

A comparison between the cathode ray tube 63 having a flat screen and a conventional cathode ray tube (conventional tube) exhibiting a curved surface shows that the difference in curvature between the inner surface and the outer surface of the conventional tube is relatively small, The thickness of the cathode ray tube 63 is substantially uniform over the entire surface and the thickness of the cathode ray tube 63 is small, whereas the outer surface of the display surface of the face panel 51 is substantially flat in the case of the flattened cathode ray tube 63. However, the thickness of the glass tends to increase from the center to the periphery,
In order to reduce the rise of the image in the peripheral part, the thickness of the glass is configured to be relatively thin. Therefore, the thickness of the central part tends to be formed thinner than the conventional pipe. .

Therefore, when manufacturing a flattened cathode ray tube 63, when a drying apparatus used for drying a solvent to be dried such as a resist or a slurry at the time of forming a phosphor screen is used, the center of the face panel 51 can be reduced. The temperature of the portion was higher than necessary, and conversely, the temperature was not sufficiently raised in the peripheral portion, resulting in an uneven temperature distribution. At this time, if the temperature is higher than necessary, the resist will be over-dried,
It is necessary to avoid heating above a predetermined temperature because the properties of the resist are impaired.

In such a non-uniform temperature distribution state, the shape and size of the black matrix holes, the phosphor dots or the stripes may be non-uniform, and the sharpness may be poor and dull, resulting in a white uniformity (white uniformity). ).

In order to solve this problem, a means for increasing a heat source 81 such as a heater for increasing the temperature in a crossover manner so as to particularly increase the temperature of the portion of the face panel 51 facing the vicinity of the inside of the skirt portion is provided. It is conceivable, however, that this would lead to a large-scale modification of the drying device and an increase in power consumption.

Further, after the temperature is increased by the heat source 81, a method of blowing cooling air to the center of the face panel 51 to make the temperature of the face panel 51 uniform can be considered, but it is difficult to control the temperature. With the air blowing, incidental problems such as the unwinding of dust by the air occur.

[0025]

As described above, in the conventional drying apparatus and the conventional drying method, there is a problem that the apparatus needs to be largely remodeled, and there are problems such as an increase in the size of the apparatus. However, there is a problem that the increase of the number is also caused. In addition, in the case of the air system, it is difficult to control the temperature to be uniform, and there has been an accompanying problem such as hoisting of dust.

The present invention makes it possible to easily adjust the distribution of the amount of heat applied to the face panel even in a flattened cathode ray tube without causing such a problem, and to make the temperature of the face panel of the cathode ray tube uniform. It is intended to provide a face panel drying apparatus and a drying method capable of achieving the following.

[0027]

SUMMARY OF THE INVENTION The present invention provides a heat source for heating and drying a solvent to be dried applied to an inner surface of a face panel, and an inner surface of the face panel facing the heat source. A fixing jig to be held, and a heat shield adjusting device that is interposed in a heat transfer path between the fixing jig and the heat source and adjusts a temperature distribution of the face panel, and the heat shield adjusting device and the fixing jig Is a face panel drying apparatus characterized by rotating relatively.

Further, the inner surface of the face panel coated with the solvent to be dried is fixed to a fixing jig with the inner surface facing outward, and heat is supplied to the solvent to be dried from a heat source to dry the solvent to be dried. In the method for drying a face panel, the heat from the heat source is supplied while being diffused.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. Since the color picture tube itself has the same configuration as that of the conventional color picture tube, a detailed description thereof will be omitted.

FIG. 1 is a schematic diagram showing a face panel drying apparatus according to the present invention, in which a plurality of heating elements 11 such as hot wires and burners are arranged in parallel, and a predetermined substantially constant value is provided over the entire surface. A predetermined interval, for example, 300 to 500 mm, to a heat source 12 such as a panel-type heater having a uniform heating value.
A face panel fixing jig 15 having a circular flat surface which is opposed to the driving device 13 such as a motor or the like by a rotation shaft 14 or the like in a predetermined rotation direction.
Is arranged.

A face panel 51 from which the shadow mask has been removed is attached to the fixing jig 15 with its inner surface facing the heat source 12. The inner surface of the face panel 51 is coated with a solvent 16 to be dried such as a resist already exposed in a pre-processing step or a developed photosensitive layer.

In addition, between the fixing jig 15 and the heat source 12, a plurality of flat blades made of a material having a high heat-resistant effect such as a rotatable stainless steel or the like that shuts off heat from the heat source 12 are used. A heat shield adjusting device 18 provided with the heat source 17 is provided, and the central axis of the heat source 12, the rotation axis of the heat shield adjusting device 18 and the rotation axis of the fixing jig 15 are arranged so as to be aligned with each other. The adjusting device 18 includes the driving device 13
, And rotational power is transmitted through a shaft 19.

The rotary blade 17 of the heat shield adjusting device 18 dynamically adjusts the amount of heat reaching the face panel 51 from the heat source 12 that heats the rotating face panel 51 by rotating the rotary blade 17. In order to do so, its size and shape are set.

Here, as shown in FIG. 2, the outermost effective area A including the broken line portion of the arc is equal to or larger than the circumference whose diameter is the diagonal length of the display area of the face panel 51. Set. The effective area A is divided into a predetermined number, and the shape of the divided part is determined by the concept described below.

That is, when the heat source 12 which is usually applied to the conventional tube is used, the temperature distribution on the inner surface of the heated face panel 51 during the drying process of the flattened cathode ray tube 63 is represented by the face panel It can be represented by a decreasing function F (r) with the center at the center of the inner surface 51 as a peak and an arbitrary distance r from the center as a variable. Therefore, the transmittance distribution by the rotary blade 17 can be represented by αF (r) obtained by multiplying the function F (r) by the constant α, and the transmittance A = αF (r).

On the other hand, the rotor 17 of the heat shield adjusting device 18
In order to rotate relative to the face panel 51,
If it is formed so as to form an arc at an arbitrary distance r from the center, the transmittance of radiant heat from the heat source 12 can be dynamically controlled by the ratio of the circumference and the arc length at this position. Can be.

Here, the length l of the arc at an arbitrary distance r
Can be expressed as follows.

L = 2πr · αF (r) Then, these arcs are continuously arranged so that the centers thereof are located on a straight line, and when both ends a and b are connected, a shape shown by a solid line in the figure is obtained. The maximum length of this arbitrary distance r is の 長 of a circle whose diameter is the diagonal length of the display area of the face panel 51 to which the distance r is applied. Even if the arc length l is divided into a plurality, if the sum is equal, an equivalent shape can be obtained. Therefore, the arc length l is divided into two as shown in FIG. 3 or as shown in FIG. It is also possible to adopt a shape divided into four.

In this case, the sum of the arc lengths in FIGS. 3 and 4 is set to be equal to the arc length 1 in FIG.
The following relationship is obtained.

1 = l1 + l2 l = l3 + l4 + l5 + l6 In the drying apparatus configured as described above, the heat source 12 heats and raises the temperature of the solvent 16 applied on the inner surface of the face panel 51 by the heat source 12 for about 1 to 2 minutes. By performing the drying process, the temperature of the face panel 51 can be made uniform.

FIG. 7 shows the temperature distribution of the face panel 51 of the flat color cathode ray tube as shown in FIG.
As a result of the measurement using the conventional drying device shown in FIG. 1 and the drying device of the present embodiment shown in FIG. 1, when the conventional drying device is used, the center portion and the corner portion of the face panel 51 have: Although a temperature difference of about 5 ° C. was generated, it was confirmed that in the case of using the drying apparatus of this embodiment, a temperature difference between the center portion and the corner portion was hardly generated.

The present invention is not limited to the above embodiment. For example, the rotation directions of the heat shield adjusting device 18 and the fixing jig 15 are rotated in the same direction, and the rotation speeds thereof are made different. , It is also possible to make a relative rotation, and in this case, the rotation driving means can be simplified.

The shape of the rotary blade 17 is not limited to a flat plate, and a function of sending a breeze to the fixing jig 15 by adding a twist to the rotary blade 17 can be added. Can transfer the radiant heat of the heat source 12 to the face panel 51 more quickly and efficiently.

Further, the length of the rotary blade 17 alone is set to be equal to or greater than the length of the effective screen diagonal line of the face panel 51, and the center of the heat shield adjusting device 18 is set on a line connecting the heat source 12 and the center of the fixing jig 15. In this case, the heat source 12 and the fixing jig 15 may be arranged in parallel in a pair, and in this case, the rotating blade 17 rotates over both of them, in other words, the shielding. If the heat adjusting device 18 is arranged at the center, the heat source 12 and the fixing jig 15 are arranged on both sides thereof, and the rotor 17 is rotated and interposed on a path connecting the heat source 12 and the fixing jig 15. In addition, a single heat shield adjusting device 18 can correspond to a plurality of heat sources 12 and a fixing jig 15.

On the contrary, it is also possible to arrange a plurality of heat shield adjusting devices 18 having different lengths of the rotary wings 17 in parallel, and to switch between them according to the size of the face panel 51 to be used. . With this configuration, the efficiency of the equipment is expected.

The driving device 13 is configured to drive the fixing jig 15 and the heat shield adjusting device 18. However, the driving device 13 may be provided separately, or a transmission such as a gear, a pulley, a belt, or the like may be performed. It is also possible to use a transmission means, and it is also possible to relatively rotate by rotating only one of the heat shield adjusting device 18 and the fixing jig 15 and fixing the other.

As described above, the present invention is not limited to the above embodiment, and various other applications and modifications are possible.

[0048]

As described above, according to the present invention, in the process of raising the temperature of the face panel, which is particularly important, in the apparatus for forming the fluorescent screen of the cathode ray tube, the equipment for shifting to the flattened cathode ray tube is used. It is possible to provide a face panel drying apparatus and a drying method which are relatively inexpensive and can be easily switched even in a process in which a conventional tube and a flattened cathode ray tube are mixed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a face panel drying apparatus according to the present invention.

FIG. 2 is an explanatory diagram for explaining a configuration of a rotary blade of a heat shield adjusting device constituting the drying device for a face panel according to the present invention.

FIG. 3 is an explanatory diagram for explaining an example of a rotary wing.

FIG. 4 is an explanatory diagram for explaining another example of the rotary wing.

FIG. 5 is a sectional view showing a conventional flat color cathode ray tube.

FIG. 6 is a sectional view showing an exposure apparatus used when manufacturing a conventional color cathode ray tube.

FIG. 7 is a schematic configuration diagram showing a conventional face panel drying device.

[Explanation of symbols]

 12: Heat source 15: Fixing jig 16: Solvent to be dried 17: Rotating blade 18: Heat shield adjusting device 51: Face panel

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F26B 25/02 F26B 25/02 (72) Inventor Hirotaka Unno 1-9-2 Hara-cho, Fukaya-shi, Saitama No. F-term in the Toshiba Fukaya Plant (reference) 3L113 AA06 AB06 AC01 AC08 AC57 AC69 AC73 AC75 BA04 BA32 DA24 5C028 HH01 JJ01

Claims (9)

[Claims] 1. A heat source for heating and drying a solvent to be dried applied to an inner surface of a face panel, and an inner surface side of the face panel is opposed to the heat source.
A fixing jig for holding the face panel, interposed in a heat transfer path between the fixing jig and the heat source,
A face panel drying device, comprising: a heat shield adjusting device that adjusts a temperature distribution of the face panel; and relatively rotating the heat shield adjusting device and the fixing jig. 2. The heat insulation adjusting device and the fixing jig,
2. The face panel drying apparatus according to claim 1, wherein the face panels are rotated in opposite directions. 3. The face panel drying apparatus according to claim 1, wherein the heat shield adjusting device and the fixing jig are rotated in the same direction, and the rotation speeds thereof are set differently. 4. The heat shield adjusting device according to claim 1, wherein the heat shield adjusting device has a plurality of rotor blades and is arranged on a central axis of the heat source and a fixing jig. The drying device for a face panel according to the above. 5. The apparatus for drying a face panel according to claim 4, wherein the rotor is disposed so as to cross a heat transfer path between the heat source and a fixing jig. 6. The rotating wing has two curves passing through the center of a circumference having a diameter equal to or greater than the diagonal length of the display area of the face panel, and an outer peripheral portion connecting the curves. The face panel drying apparatus according to claim 4 or 5, wherein the shape is set. 7. A face panel having an inner surface coated with a solvent to be dried is fixed to a fixing jig with the inner surface facing outward, and heat is supplied to the solvent to be dried from a heat source to dry the solvent to be dried. A method for drying a face panel, comprising supplying heat while diffusing heat from the heat source. 8. As means for diffusing heat, a heat shield adjusting device is interposed between the heat source and the fixing jig, and the heat is adjusted by relatively rotating the heat insulating adjusting device and the fixing jig. The method for drying a face panel according to claim 7, characterized in that: 9. The method for drying a face panel according to claim 7, wherein, as the means for diffusing the heat, the heat shield adjusting device and the fixing jig are rotated in mutually opposite directions.