JP2002184305A - Manufacturing method of color cathode-ray tube and color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce equipment by reducing the number of heaters and number of the power sources for the heaters. SOLUTION: In the manufacturing method of a color cathode-ray tube having a process of forming a metal back layer on a phosphor layer 3 on the inner wall of a panel 2 and a process of forming a heat absorption membrane on the metal back layer, the metal back layer and the heat absorption membrane are formed by heating at a time and evaporating in order the plural substances 7, 8 having different evaporation temperature by a single heater 5 that will bring about difference in arrival temperature according to part. Thereby, the number of heaters and the number of power sources of the heaters can be reduced, and the manufacturing cost of the color cathode-ray tube can be reduced and the equipment specifications such as the layout of the heaters can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color cathode ray tube and a color cathode ray tube in which a metal back layer and a heat absorbing film are sequentially formed on a phosphor layer on the inner surface of a panel, and more particularly to a different temperature. The present invention relates to a method for manufacturing a color cathode ray tube and a color cathode ray tube in which a plurality of substances having different deposition temperatures are heated at a time by a single heater having a plurality of grooves and sequentially deposited to form a metal back layer and a heat absorbing film. It is.

[0002]

2. Description of the Related Art In a conventional method of manufacturing a color cathode ray tube, in particular, a method of manufacturing a panel, a method of forming a metal back layer by vacuum-depositing aluminum after forming a phosphor layer on the inner surface of the panel has been widely adopted. I have.

FIG. 9 is a schematic side sectional view showing an example of the configuration of a main part of a color cathode ray tube. A phosphor layer 33 is applied to the inner surface of the panel 32 of the color cathode ray tube 31, and a color selection mechanism such as the aperture grill 3
5 and the electron gun 36 are incorporated in the color cathode ray tube 31. A slit is provided in the aperture grill 35, and an electron beam 37 emitted from the electron gun 36 and transmitted through these slits is incident on a predetermined phosphor pattern in the phosphor layer 33, and a predetermined phosphor pattern is formed. It is designed to emit light.

[0004] In FIG. 9, the phosphor layer 33 is simply used for easy understanding. However, in an actual manufacturing process, the phosphor stripes or dots of red, green, and blue on the inner surface of the panel 32 are formed. After the carbon film is arranged in the gap, an intermediate film for smoothing the surface of the phosphor stripe or dot is formed.

On the phosphor layer 33, a metal back layer 38 made of aluminum is vacuum-deposited. In this way, the accelerated electron beam 37 emitted from the electron gun 36 penetrates the metal back layer 38 through the aperture grill 35 to emit light from the phosphor layer 33, but from the phosphor layer 33 toward the aperture grill 35. The incoming light is reflected toward the panel 32 by the metal back layer 38 to increase the brightness, the potential of the phosphor layer 33 is stabilized by the metal back layer 38, and the burning of the phosphor layer 33 due to ion bombardment is prevented. 38 can be prevented.

When the electron beam 37 emitted from the electron gun 36 collides with the aperture grill 35, the temperature of the aperture grill 35 rises, and the aperture grill 35 generates radiant heat. When this radiant heat enters the metal back layer 38, is reflected by the metal back layer 38, and again enters the aperture grill 35, the temperature of the aperture grill 35 further increases, and the amount of thermal drift, that is, the amount of thermal deformation of the aperture grill 35 is reduced. More.

When the amount of thermal drift of the aperture grille 35 increases, the relative positional relationship between the slit of the aperture grille 35 and the phosphor pattern in the phosphor layer 33 changes, causing a shift in electron beam landing and causing color shift. Deviation occurs. Therefore, the radiant heat incident on the metal back layer 38 from the aperture grill 35 is absorbed so as not to be reflected by the metal back layer 38, and the electron back 37 is irradiated with the electron beam 37 directly to the metal back layer 38. A heat absorbing film 39 is provided on the metal back layer 38 to suppress radiant heat from the surface to the aperture grill 35.

As a method for forming the heat absorbing film 39 on the metal back layer 38, a method of vacuum-depositing a heat absorbing film deposition material by a heat absorbing film deposition heater is widely known. FIG. 10 is a schematic side sectional view showing an example of a vacuum chamber in a vacuum evaporation apparatus. The panel 32 is placed on the vacuum chamber 41. The aperture grill 35 is temporarily removed when the metal back layer 38 and the heat absorbing film 39 are formed. In the vacuum chamber 41, a metal back vapor deposition heater 42 and a heat absorbing film vapor deposition heater 43 are arranged.

In the grooves of the metal back vapor deposition heater 42 and the heat absorbing film vapor deposition heater 43, a metal back vapor deposition material 50 made of aluminum and a heat absorbing material made of chromium as a substance having high heat absorption are provided by material supply means (not shown). The vapor deposition material 51 for an absorption film is supplied.

First, a switch (not shown) is operated in a state where the panel 32 having the phosphor layer 33 coated on the inner surface thereof is placed on the vacuum chamber 41 as shown in FIG. The metal back evaporation heater 42 is connected to the metal back evaporation heater 42 via the cords 45 and 45 to heat the metal back evaporation heater 42. When the metal back deposition heater 42 is heated, the metal back deposition material, ie, aluminum 50 reaches the evaporation temperature and evaporates, deposits on the inner surface of the phosphor layer 33 of the panel 32, and as shown in FIG. Then, a metal back layer 38 is formed.

Next, the heat absorbing film heater power supply 49 is connected to the heat absorbing film deposition heater 43 via power cords 48 and 48.
And heating the heat-absorbing film deposition heater 43,
The evaporation material 51 for a heat absorbing film reaches the evaporation temperature and evaporates,
Vapor deposition is performed on the inner surface of the metal back layer 38 to form a heat absorbing film 39 as shown in FIG.

[0012]

Generally, aluminum is used as a metal back deposition material, and the melting point of aluminum is about 660 ° C. On the other hand, a substance serving as a material for a heat absorbing film generally has a high melting point, for example, chromium has a melting point of about 1900 ° C. Therefore, a method has been adopted in which a metal-back deposition heater for depositing aluminum and a heat-absorbing-film deposition heater for depositing chromium and the like are separately provided for deposition. The necessity of a metal-back evaporation heater and a heat-absorbing film evaporation heater makes it difficult to dispose both evaporation heaters, and also requires an evaporation power source for each of the two evaporation heaters.

In general, a single panel is provided with a plurality of vapor deposition heaters for the metal back and a plurality of vapor deposition heaters for the heat absorbing film. Therefore, as the number of vapor deposition heaters increases, the number of power supplies for the vapor deposition heaters also increases. There has been a problem that the manufacturing cost of the tube is increased and the equipment specifications such as the layout of the vapor deposition heater are complicated.

As the number of vapor deposition heaters and the number of power supplies for vapor deposition heaters increase, the number of facilities to be managed increases, so that a large number of facilities must be maintained and managed. The problem has arisen.

It is an object of the present invention to provide a method of manufacturing a color cathode ray tube which reduces the number of heaters and the number of power supplies for the heater to reduce the number of facilities, and a color cathode ray tube manufactured by the method. It is intended for.

[0016]

A method of manufacturing a color cathode ray tube according to the present invention comprises the steps of forming a metal back layer on a phosphor layer on the inner surface of a panel, and forming a heat absorbing film on the metal back layer. In the method for manufacturing a color cathode-ray tube having a step of, a plurality of substances having different deposition temperatures are heated at a time by a single heater having a difference in ultimate temperature depending on a portion and sequentially deposited to form the metal back layer and the heat absorbing film. It is characterized by forming.

In the method for manufacturing a color cathode ray tube according to the present invention, a plurality of substances having different deposition temperatures are heated at a time by a single heater having a difference in ultimate temperature depending on portions, and are sequentially deposited to form a metal back layer and a heat absorbing film. Since it is formed, there is no need to separately provide a heater for the metal back and a heater for the heat absorbing film, a single heater is required, the number of heaters can be reduced, and the number of power supplies for the heater can be reduced accordingly, color The manufacturing cost of the cathode ray tube can be reduced, and the equipment specifications such as the layout of the heater can be simplified.
Further, as the number of heaters and the number of power supplies for the heaters decrease, the number of facilities to be managed is greatly reduced, and maintenance management of the facilities can be reduced.

The color cathode ray tube according to the present invention is a color cathode ray tube wherein a metal back layer is formed on a phosphor layer on the inner surface of a panel, and a heat absorbing film is formed on the metal back layer. And the heat absorbing film is formed by heating a plurality of substances having different deposition temperatures at a time by a single heater having a difference in ultimate temperature depending on portions, and sequentially depositing the substances.

In the color cathode ray tube according to the present invention, the materials having different deposition temperatures are heated at a time by a single heater in which a difference in ultimate temperature is generated depending on the portions, and the metal back layer and the heat absorbing film are formed by sequentially depositing the materials. A single heater can be used, and the number of heaters can be reduced, and accordingly, the number of heater power supplies can be reduced, so that the cost of manufacturing a color cathode ray tube can be reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a color cathode ray tube according to the present invention will be described below with reference to the drawings. FIG. 2 is a side view of a vacuum deposition apparatus used to carry out the method for manufacturing a color cathode ray tube according to the present invention.
In the vacuum evaporation apparatus 21, a vacuum chamber 23 and an operation unit 24 are provided on a base 22, and a panel 2 of a color cathode ray tube is mounted on the vacuum chamber 23.

FIG. 1 is a schematic side sectional view showing an example of the vacuum chamber 23. The phosphor layer 3 is applied to the inner surface of the panel 2. The evaporation heater 5 is arranged in the vacuum chamber 23. The deposition heater 5 is a dual-purpose heater for a metal back and a heat absorbing film. The vapor deposition heater 5 is provided with a groove 5a-1 for heating the metal back vapor deposition material and a groove 5b-1 for heating the heat absorbing film vapor deposition material, and a material (not shown) is provided in the groove 5a-1. The metal back deposition material 7 is supplied by the supply means, and the heat absorbing film deposition material 8 which is a substance having good heat absorption is supplied to the groove 5b-1 by the material supply means (not shown). The evaporation heater 5 has power cords 9, 9
The heater power supply 10 is installed outside the vacuum chamber 23.

According to the present invention, in the step of sequentially forming a metal back layer 12 and a heat absorbing film 13 to be described later on the phosphor layer 3 on the inner surface of the panel 2 (see FIG. 7), metal back deposition materials having different deposition temperatures are used. 7 and the heat-absorbing film-forming material 8 are provided with grooves 5a-
The metal back layer 12 and the heat absorbing film 13 are formed by heating at 1,5b-1 at a time and sequentially depositing.

FIG. 3 is a perspective view of the vapor deposition heater 5. The vapor deposition heater 5 is, for example, a boron nitride (boron nitride) heater, and has a wide portion 5a and a narrow portion 5b.
The wide portion 5a is provided with a groove 5a-1 for heating the metal back deposition material, and the narrow portion 5b is provided with a groove 5a for heating the heat absorption film deposition material.
b-1 is provided. The metal back deposition material 7 supplied to the groove 5a-1 is, for example, aluminum, and the heat absorption film deposition material 8 supplied to the groove 5b-1 is, for example, chromium. Aluminum has a melting point of about 660 ° C., whereas chromium has a melting point of about 1900 ° C., so that the grooves 5a-1, 5b
-1 and the shape of the vapor deposition heater 5 are set.

That is, the grooves 5a-1,
The ultimate temperature of the grooves 5a-1 and 5b-1 can be changed by changing the width, length and depth of 5b-1, and the width and height of the vapor deposition heater 5. Changing the width and height of the vapor deposition heater 5 and the width and depth of the grooves 5a-1 and 5b-1 change the cross-sectional area. When the cross-sectional area is large, the electric resistance decreases and the ultimate temperature decreases. On the other hand, when the cross-sectional area is small, the electric resistance increases and the ultimate temperature increases. Therefore, when the cross-sectional area of the groove 5a-1 is made larger than that of the groove 5b-1, the electric resistance is reduced and the temperature reached is reduced, and the metal back deposition material 7 such as aluminum is heated and evaporated. Will be adapted to On the other hand, when the cross-sectional area of the groove 5b-1 is smaller than that of the groove 5a-1, the electric resistance is increased and the attained temperature is increased. For example, chromium which is the heat absorbing film deposition material 8 is heated. It is possible to evaporate.

FIG. 4 shows the deposition heater 5 and the grooves 5a-1 and 5b.
FIG. 3 is a plan view showing a shape example of -1. The groove 5a-1 for heating the metal back deposition material is referred to as a groove A, and the groove 5b-1 for heating the heat absorbing film deposition material is referred to as a groove B. The shape 1 has a wide portion 5a having a width of 6 mm, a narrow portion 5b having a width of 5 mm, and the groove portions A and B having a width of 3 mm and a length of 30 mm.
It is. In addition, the vapor deposition heater 5 is used for the shapes 1, 2, 3 and 4.
Has a height of 4 mm, and the depth of the groove portions A and B is 2 mm.

In the shape 2, the width of the wide portion 5a is 6 mm, the width of the narrow portion 5b is 4 mm, and the width of the groove portions A and B is 3 m.
m, length is 30 mm.

In the shape 3, the width of the wide portion 5a is 6 mm, the width of the narrow portion 5b is 4 mm, and the width of the groove portions A and B is 2 m.
m, length is 30 mm. In the shape 4, the width of the wide portion 5a is 7 mm, the width of the narrow portion 5b is 3.5 mm, and the groove portions A and B are 3 mm in width and 30 mm in length.

FIG. 5 is a diagram showing the temperatures reached by the grooves A and B for each shape. The horizontal column is the shape, and the vertical column is the set voltage. For example, in the case of the shape 1, when the voltage is set to 7.5 V, the ultimate temperature of the groove A is 1200 ° C., and the ultimate temperature of the groove B is 1450 ° C. In the case of shape 4, the voltage is
When it is set to 10.5 V, the ultimate temperature of the groove A is 1290 ° C., and the ultimate temperature of the groove B is 1900 ° C. Thus, by changing the shape of the vapor deposition heater 5 and the shapes of the grooves A and B,
The ultimate temperature of the grooves A and B can be changed.

Next, a method for manufacturing a color cathode ray tube will be specifically described. First, as shown in FIG. 1, the panel 2 having the phosphor layer 3 applied on the inner surface is placed on the vacuum chamber 23. The aperture grill is a metal back layer 1 described later.
When the heat absorbing film 2 and the heat absorbing film 13 are formed, they are temporarily removed. Then, the inside of the vacuum chamber 23 is evacuated by a pump or the like (not shown), and the vacuum heater 23 is energized when the pressure of the vacuum chamber 23 becomes lower than a predetermined pressure. That is, the button of the operation unit 24 is operated to connect the heater power supply 10 to the vapor deposition heater 5 via the power cords 9, 9 to heat the vapor deposition heater 5. Assuming that the vapor deposition heater 5 and the grooves A and B have, for example, the shape shown in the shape 4 and the voltage is set to 10.5 V, the temperature reached in the groove A is 1290 ° C. and the temperature reached in the groove B is 1900 ° C.

When the deposition heater 5 is heated, first, the groove 5a-1 (groove A) has a melting point of about 660, which is the melting point of aluminum.
When the temperature reaches ° C., the aluminum material as the metal back vapor deposition material 7 evaporates and is vapor-deposited on the inner surface of the phosphor layer 3 of the panel 2 to form the metal back layer 12 as shown in FIG.

Next, when the groove 5b-1 (groove B) reaches about 1900 ° C., which is the melting point of chromium, the chromium material as the heat absorbing film deposition material 8 evaporates and is deposited on the inner surface of the metal back layer 12. Thus, a heat absorbing film 13 is formed as shown in FIG.

At this time, as shown in FIG. 8, the groove 5a-1
(Groove A) and Groove 5b-1 (Groove B) have a temperature of about 12
Since the temperature difference differs by 00 degrees, the groove portion A reaches the predetermined temperature faster than the groove portion B, and the metal back layer 12 is formed during the time t by always depositing aluminum first,
Chromium is deposited later to form a heat absorbing film 13 on the inner surface of the metal back layer 12.

As a result, the heat absorption film 13 is formed after the metal back layer 12 is formed once, so that the two-layer structure is clearly formed, and the metal back layer 12 and the heat absorption film 1 are formed.
3 can sufficiently exhibit its function. FIG.
In the figure, t indicates the elapsed time from the time when the temperature of the groove A is reached to the time when the temperature of the groove B is achieved.

Therefore, the metal back deposition material 7 and the heat absorbing film deposition material 8 at different deposition temperatures are simultaneously formed by the two grooves 5a-1 and 5b-1 at different temperatures reached by the single deposition heater 5. By heating and sequentially depositing, a metal back layer and a heat absorbing film can be sequentially formed. For this reason,
There is no need to provide a separate deposition heater for the metal back and a deposition heater for the heat absorbing film, a single deposition heater is sufficient, and the number of deposition heaters can be reduced, and the number of deposition heater power supplies can be reduced accordingly. The manufacturing cost of the color cathode ray tube can be reduced, and the equipment specifications such as the layout of the vapor deposition heater can be simplified.

In particular, since the deposition heater 5 can be disposed at the center of the panel 2, the layout of the deposition heater can be extremely simplified.

Further, as the number of vapor deposition heaters and the number of power supplies for vapor deposition heaters decrease, the number of facilities to be managed decreases.
Maintenance management of equipment such as replacement of a deposition heater can be reduced.

In the above-described embodiment, chromium is used as the material having good heat absorption. However, the present invention is not limited to this. Of course, other materials having good heat absorption such as manganese and tin may be used. Although the vapor deposition heater 5 is a boron nitride (boron nitride) heater, it is needless to say that the present invention is not limited to this, and another heater such as a tungsten heater may be used.

[0038]

As described above, according to the present invention,
A single heater, which has a difference in ultimate temperature depending on the part, heats multiple substances with different deposition temperatures at once and deposits them sequentially to form a metal back layer and a heat absorbing film. There is no need to provide separate heaters, a single heater is sufficient, the number of heaters can be reduced, and the number of power supplies for heaters can be reduced accordingly, and the cost of manufacturing color cathode ray tubes can be reduced. Equipment specifications such as layout can be simplified. Further, as the number of heaters and the number of power supplies for heaters decrease, the number of facilities to be managed is greatly reduced, and maintenance management of facilities such as replacement of heaters can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing a vacuum chamber in a vacuum evaporation apparatus used in one embodiment of the present invention.

FIG. 2 is a side view of a vacuum evaporation apparatus used in one embodiment.

FIG. 3 is a perspective view of a deposition heater.

FIG. 4 is a diagram showing examples of shapes of a vapor deposition heater and a groove.

FIG. 5 is a diagram showing an attained temperature of a groove for each shape.

FIG. 6 is an explanatory view of a step of forming a metal back layer on the phosphor layer on the inner surface of the panel.

FIG. 7 is an explanatory diagram of a step of forming a heat absorbing film on a metal back layer.

FIG. 8 is a diagram showing a time required to reach a temperature reached by a groove A and a groove B.

FIG. 9 is a schematic side sectional view showing an example of a main part configuration of a color cathode ray tube.

FIG. 10 is an explanatory view of a step of forming a conventional metal back layer.

FIG. 11 is an explanatory diagram of a step of forming a conventional heat absorbing film.

[Explanation of symbols]

2 ... panel, 3 ... phosphor layer, 5 ... vapor deposition heater (heater), 5a ... wide part, 5b ...
Narrow portion, 5a-1 ... groove (groove A), 5b-1 ...
・ Groove (groove B), 7: evaporation material for metal back (aluminum), 8: evaporation material for heat absorbing film, 10
... heater power supply, 12 ... metal back layer, 13
... Heat absorbing film, 21 ... Vacuum deposition device, 23 ...
Vacuum chamber

Claims (7)

[Claims] 1. A method for manufacturing a color cathode ray tube, comprising: a step of forming a metal back layer on a phosphor layer on an inner surface of a panel; and a step of forming a heat absorbing film on the metal back layer. A method for manufacturing a color cathode ray tube, wherein a plurality of substances having different deposition temperatures are heated at a time by a single heater having a temperature difference and are sequentially deposited to form the metal back layer and the heat absorbing film. 2. The heater has a plurality of grooves having different arrival temperatures, supplies a plurality of substances having different deposition temperatures to the plurality of grooves, respectively, and heats the plurality of substances having different deposition temperatures at a time. 2. The method according to claim 1, wherein the deposition is performed sequentially. 3. The method according to claim 2, wherein the ultimate temperature of the groove can be changed by changing the shape of the groove. 4. The method for manufacturing a color cathode ray tube according to claim 2, wherein the ultimate temperature of the groove can be changed by changing the shape of the heater. 5. The method for manufacturing a color cathode ray tube according to claim 2, wherein the ultimate temperature of the groove can be changed by changing the shape of the heater and the shape of the groove. 6. The method according to claim 1, wherein the plurality of materials having different deposition temperatures are materials having good heat absorption with aluminum. 7. A color cathode ray tube in which a metal back layer is formed on a phosphor layer on an inner surface of a panel, and a heat absorbing film is formed on the metal back layer, wherein the metal back layer and the heat absorbing film are A color cathode ray tube formed by heating a plurality of substances having different deposition temperatures at a time by a single heater in which an attained temperature difference occurs depending on portions, and sequentially depositing the materials.