JP3300459B2 - Light amount correction filter for forming phosphor screen of color picture tube and method of exposing phosphor screen of color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light amount correction filter for forming a fluorescent screen of a color picture tube, which is used when a phosphor screen of a color picture tube is formed by a photographic printing method, and a color filter.
The present invention relates to a phosphor screen exposure method for a picture tube .

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a color picture tube has an envelope composed of a panel 1 and a funnel 2 integrally joined to the panel 1. A phosphor screen consisting of a three-color phosphor layer that emits green and red light
A shadow mask 4 having a large number of electron beam passage holes formed therein is disposed opposite the fluorescent screen 3. Meanwhile, within the neck 5 of funnel 2,
An electron gun 7 for emitting three electron beams 6B, 6G, 6R is provided. Then, the three electron beams 6B, 6G, 6R emitted from the electron gun 7 are deflected by the magnetic field generated by the deflection yoke 8 mounted outside the funnel 2, and
Are horizontally and vertically scanned to display a color image.

As shown in FIG. 4 and FIG. 5, a fluorescent screen 3 in which three-color phosphor layers 10B, 10G and 10R in the form of dots or stripes which emit blue, green and red light are closely arranged as the fluorescent screen 3 is shown. There is a side. As shown in FIGS. 6 and 7,
There is a fluorescent screen called a black matrix type or a black stripe type in which the three-color phosphor layers 10B, 10G, and 10R are formed to be embedded in gaps between the matrix-shaped or stripe-shaped light absorbing layers 11.

[0004] phosphor screen of a color picture tube is made form a conventionally printing method. For example, for the black matrix type or black stripe type fluorescent screen 3 having the light absorbing layer 11 shown in FIG. 6 or FIG.
As shown in FIG. 8A, a photosensitive film 13 containing polyvinyl alcohol (PVA) and ammonium bichromate (ADC) as main components is applied and formed on the inner surface of the panel, and as shown in FIG. Using the photosensitive film 13 as a shadow mask 4
Exposure through the shadow mask 4
After the pattern corresponding to the pattern 14 is printed, the pattern is developed to form a resist film 15 having a pattern corresponding to the electron beam passage hole of the shadow mask on the inner surface of the panel 1 as shown in FIG. Next, as shown in (d), a light absorbing paint layer 16 is applied to the inner surface of the panel 1 on which the resist film 15 is formed, and then the light absorbing paint on the resist film 15 is removed together with the resist film 15. After the removal, the light absorbing layer 17 in the form of a matrix or a stripe is formed as shown in FIG.

Thereafter, as shown in FIG. 1 (f), a phosphor and a PV are placed on the inner surface of the panel 1 on which the light absorbing layer 17 is formed.
A phosphor slurry layer 19 mainly composed of A, ADC, etc. is applied and formed, and as shown in FIG.
Is exposed through the shadow mask 4
After the pattern corresponding to the electron beam passage hole 14 is printed, the pattern is developed and, as shown in (h), a phosphor layer of any one color, for example, a blue phosphor layer is provided in a predetermined gap of the light absorbing layer 17. Ten
Form B By repeating the process of forming the phosphor layer 10B for the three-color phosphor, as shown in FIG.
The three-color phosphor layers 10B, 10G, 10R are provided in each gap of the light absorption layer 17.
To form

The phosphor screen having no light absorbing layer shown in FIGS. 4 and 5 is formed by repeating the above-mentioned phosphor layer forming step for the three-color phosphor.

In order to form the light absorbing layer and the three-color phosphor layer, a pattern corresponding to an electron beam passage hole of a shadow mask is printed on a phosphor screen forming member layer such as a photosensitive film or a phosphor slurry layer. As shown in FIG. 9, an exposure light source 23 such as a mercury lamp is provided below a support 22 for positioning and supporting the panel 1 on which the phosphor screen forming member layer 21 is formed on the inner surface and on which the shadow mask 4 is mounted. An optical lens system 25 such as a correction lens that is installed on the light source 23 and sequentially radiates the light 24 emitted from the light source 23 to the trajectory of the electron beam, and the fluorescent screen forming member layer 21 formed on the inner surface of the panel 1. An exposure apparatus provided with a light amount correction filter 26 for correcting the light amount distribution is used.

The light amount correction filter 26 of this exposure apparatus is
In addition to the light intensity distribution of the light 24 emitted from the light source 23, the panel
1 The distance from the light source 23 and the light
The difference in the incident angle of 24 causes a light amount difference, and a uniform or desired light amount distribution cannot be obtained over the entire phosphor screen, and the formed light absorbing layer or phosphor layer does not have a predetermined size. 1 This is for optimizing the light quantity distribution from the central part to the peripheral part of the inner surface, and a metal such as Ni or Cr is deposited on one surface of a light transmitting substrate 28 made of transparent glass to form a metal deposited film 29. The thickness of the metal vapor-deposited film 29 is changed to suppress the light transmittance at the central portion, and to increase the light transmittance toward the peripheral portion.

However, as described above, it is not easy to adjust the light transmittance distribution by the thickness of the metal deposition film 29, and the reproducibility is poor. For this reason, there is a problem that the gap between the light absorbing layers to be formed and the phosphor layer do not have a predetermined size due to the difference in the light transmittance distribution.

That is, one of the characteristic evaluations of a color picture tube is a white uniformity for evaluating the uniformity of an entire screen by making the whole area white, and this white uniformity is based on a gap portion of a light absorbing layer and a phosphor. The size of the layer plays a major role. Therefore, in order to improve the white uniformity of the color picture tube, it is extremely important to accurately control the gap between the light absorbing layers and the size of the phosphor layer.

In order to solve the problem of the light amount correction filter 26 , several measures have been proposed in the past.
As one example, Japanese Patent Application Laid-Open No. 50-46254 discloses a light amount correction filter in which a number of dots (light-shielding portions or light-transmitting portions) having light characteristics different from the surroundings are provided according to a desired density distribution. .

However, with respect to this light amount correction filter, no clear design method for determining the dot size and dot interval for obtaining the transmittance distribution has been proposed.

[0013]

As described above, the phosphor screen of the color picture tube is formed on a phosphor screen forming member layer such as a photosensitive film or a phosphor slurry layer formed on the inner surface of the panel by photographic printing. It is formed by printing a pattern corresponding to the electron beam passage holes of the shadow mask. In printing this pattern, a light source for exposure is installed below a support for positioning and supporting a panel on which a phosphor screen forming member layer is formed on the inner surface and a shadow mask is mounted, and an optical lens system and a panel are provided on the light source. An exposure apparatus provided with a light amount correction filter for correcting the light amount distribution with respect to the phosphor layer forming member layer formed on the inner surface is used.

Usually, the light amount correction filter is formed by vapor-depositing a metal vapor-deposited film having a difference in film thickness on a light-transmitting substrate so that the light transmittance at the central portion is suppressed and the light transmittance increases toward the peripheral portion. What was used is used. However, it is not easy to correct the light transmittance so as to have a desired distribution according to the thickness of the metal deposition film as in the light amount correction filter, and the reproducibility is poor. Therefore, the difference in the light transmittance distribution, the gap and the phosphor layer of the light-absorbing layer to be formed is a problem that did not hit their predetermined size.

Conventionally, as a light quantity correction filter for solving such a problem, a light quantity correction filter provided with a large number of dots formed of light-shielding portions or light-transmitting portions having different light characteristics with respect to the surroundings according to a desired density distribution has been known. Are known. However, for such a light amount correction filter,
There is no clear design method for determining the dot size and dot spacing for obtaining the transmittance distribution.

The present invention has been made in view of the above-mentioned problems, and the size or interval of a large number of dots (small sections) comprising a light-shielding portion or a light-transmitting portion can be easily designed with a high degree of freedom. By accurately controlling the size of the phosphor layer and the size of each color phosphor layer, which could not be controlled accurately in the past, the white uniformity of the screen was improved.
It is a first object to obtain a light amount correction filter for forming a fluorescent screen of a color picture tube .

Further , using this light amount correction filter,
Light absorption that could not be formed to the specified size conventionally
Precisely control the gap between layers and the phosphor layer to a predetermined size
Color that gives good white uniformity
It is a second object of the present invention to obtain a method of exposing a fluorescent screen of a picture tube.
You.

[0018]

A light-shielding portion or light-transmitting portion composed of a large number of small sections is formed continuously or discontinuously on a light-transmitting substrate. Or a light-shielding portion between the light-transmitting portions, and changing the area ratio between the light-shielding portion and the light-transmitting portion to obtain a desired transmitted light amount distribution. Px (X, Y) and Px are the distances in the x-axis and y-axis directions of the adjacent light-shielding portions or light-transmitting portions at arbitrary positions X and Y on the light-transmitting substrate represented by coordinates.
y (X, Y), x-axis of light-shielding portion or light-transmitting portion and y
The lengths in the axial direction are Dx (X, Y), Dy (X,
Y), m and n are positive integers consisting of 1, 2, 3,.
When M1, M2, M3, M4, N1, N2, N3, and N4 are arbitrary positive integers and αmn, βmn, γmn, and δmn are coefficients, the above Px (X, Y), Py (X, Y) )
, Dx (X, Y ) and Dy (X, Y) are as follows:

(Equation 7)

(Equation 8)

(Equation 9)

(Equation 10) And the light transmittance at the arbitrary positions X and Y is T
When (X, Y) is used, when the small section is a light transmitting section, the following equation 11 is used, and when the small section is a light shielding section, the following equation 12 is used.

[Equation 11]

(Equation 12) The light amount correction filter represented by

Further , a light amount correction filter is arranged on the light source.
And the light emitted from the light source
Phosphor-forming member layer formed on the inner surface of the panel by light
Pattern corresponding to the electron beam passage hole in the shadow mask
In the method of exposing a phosphor screen of a color picture tube for printing
2. A phosphor screen of a color picture tube according to claim 1 on a light source.
Arrange one or more filters for compensation of
Electron beam passage hole of shadow mask in member layer for forming optical surface
The pattern corresponding to is printed.

[0020]

As described above, a light amount correction filter having a desired light transmittance distribution is designed by changing the size or interval of a light shielding portion or a light transmitting portion composed of a large number of small sections provided continuously or discontinuously. In this case, the size or interval of the light-shielding portion or the light-transmitting portion can be quantitatively and accurately controlled by using the formula (11) when the small portion is the light-transmitting portion and the formula (12) when the small portion is the light-shielding portion. In addition, since it has a high degree of freedom, it can be easily designed and manufactured. In designing and manufacturing such a light amount correction filter, both the size and the interval of the small section in the x and y directions may be changed, or one of the size and the interval may be changed and the other may be fixed. Due to the penumbra effect caused by not being a point light source, the size and spacing of the small sections required to eliminate the shadow of the light-shielding part on the inner surface of the panel, and the distance from the exposure light source to the light amount correction filter and the phosphor screen And the desired light amount correction filter can be freely set.

The color light source according to claim 1 is provided on a light source.
-One light intensity correction filter for forming the fluorescent screen of the picture tube
Is a phosphor screen with multiple light sources.
Compatible with electron beam passage holes in shadow masks for forming member layers
When the pattern is printed , the gap between the light absorbing layers and the size of the three-color phosphor layer can be accurately controlled, and a color picture tube with good white uniformity can be obtained.

[0022]

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

Embodiment 1 FIG. As shown in FIG. 1, this light amount correction filter is a light amount correction unit for a circular area at the center of a light transmitting substrate 30 made of glass.
The light amount correction unit 31 includes a plurality of light-shielding units 32 each composed of a number of rectangular dot-shaped small sections arranged at predetermined intervals in a direction orthogonal to each other. It is formed in the structure shown.

That is, in the xy orthogonal coordinate system in which the center O of the light quantity correcting section 31 is set as the origin and the orthogonal arrangement direction of the light shielding sections 32 is the coordinate axis, the arbitrary position A of the light quantity correcting section 31
Px (X, Y), Py (X, Y), and the light-shielding portion
Dx (X, X,
Y), Dy (X, Y), the light transmittance is T (X, Y), m,
Assuming that n is a positive integer consisting of 1, 2, 3,..., M and N are arbitrary integers, and αmn, βmn, γmn, and δmn are coefficients,
32 intervals Px (X, Y), Py in the x-axis and y-axis directions
(X, Y), and the lengths Dx (X, Y) and Dy (X, Y) of the light-shielding portion 32 in the x-axis and y-axis directions are respectively given by the following equations.
3, represented by Equation 14, Equation 15, and Equation 16,

(Equation 13)

[Equation 14]

(Equation 15)

(Equation 16) The light transmittance T (X, Y) at an arbitrary position A (X, Y) is represented by Expression 17.

[Equation 17]

As described above, the interval Px (X,
Y), Py (X, Y) and length Dx (X, Y), Dy
(X, Y), and set these intervals Px (X, Y), Py
(X, Y) and the lengths Dx (X, Y), Dy (X, Y) are steplessly changed from the center O of the light amount correction unit 31 to the periphery, so that the light shielding units 32 are orthogonal to each other. Do x
When arranged in a grid in the axis and y-axis directions, an arbitrary position A (X,
The light transmittance T (X, Y) in Y) can be easily set as the target light transmittance, and a light quantity correction filter having a desired light transmittance distribution can be easily manufactured.

Such a light amount correction filter is a photomask (negative master) used when manufacturing an electron beam passage hole of a shadow mask by a photoetching method.
For example, it can be easily manufactured by a photoplotter using a laser beam, which is used for drawing a pattern. That is, a laser light is irradiated on a glass dry plate having a transparent glass substrate on which an emulsion layer is applied and formed by the above-mentioned photoplotter, and a rectangular light-shielding portion is sequentially printed at a predetermined size and a predetermined interval in the x and y directions. , By developing.

In forming the fluorescent screen of the color picture tube,
Exposure by arranging one light amount correction filter at the position of the light amount correction filter of a conventionally used exposure apparatus
To form a light absorbing layer or a three-color phosphor layer,
Alternatively, three light amount corrections corresponding to each color phosphor layer
By arranging a filter and exposing, a three-color phosphor layer
To form That is, the exposure light of the exposure apparatus shown in FIG.
The light 24 emitted from the light source 23 is converted into an electron beam
With an optical system 25 such as a correction lens that approximates the orbit of
The light intensity correction filter is placed on the
The forming member layer 21 is formed and the shadow mask 4 is attached.
Panel 1 positioned on the support base 22 and
By the emitted light 24, through the light amount correction filter,
The electron beam of the shadow mask 4 is applied to the phosphor layer forming member layer 21.
The phosphor screen is printed by printing the pattern corresponding to the passage hole.
Is formed, and a color picture tube with good white uniformity can be manufactured.

Embodiment 2 FIG. As shown in FIG. 2, a central circular region of a light transmitting substrate 30 made of glass is used as a light amount correcting unit 31, and a light transmitting unit 33 composed of a number of rectangular dot-shaped small sections is orthogonal to the light amount correcting unit 31. Are arranged at predetermined intervals in the direction in which
A light amount correction filter having a desired light transmittance distribution can also be used as the light shielding portion 32 between the spaces 33.

In this case, Px in Expressions 13 and 14
(X, Y) and Py (X, Y) are respectively assigned to x
Dx in Equations 15 and 16 for the distance between the axis and y axis
(X, Y), Dy (X, Y)
Assuming that the length is in the axial and y-axis directions, the light transmittance T (X, Y) at an arbitrary position A (X, Y) of the light amount correction unit 31 is expressed by the following equation.
8 is obtained.

(Equation 18)

As described above, the interval Px (X,
Y), Py (X, Y) and length Dx (X, Y), Dy
(X, Y), and set these intervals Px (X, Y), Py
(X, Y), and the lengths Dx (X, Y) and Dy (X, Y) are steplessly changed from the center O of the light amount correction unit 31 to the periphery, and the light transmission units 33 are mutually changed. Orthogonal x
When arranged in a grid in the axis and y-axis directions, an arbitrary position A (X,
The light transmittance T (X, Y) in Y) can be easily set as the target light transmittance, and a light quantity correction filter having a desired light transmittance distribution can be easily manufactured.

Embodiment 3 FIG. In the first embodiment, the light-shielding portion made of rectangular dot-shaped small sections is used. In the second embodiment, the length and the interval of the light-transmitting portion made of the same rectangular dot-shaped small section are set steplessly in directions orthogonal to each other. The light-amount correction filters arranged so as to be changed in the above manner have been described. However, the light-shielding portion or the light-transmitting portion is steplessly changed only in length in a direction orthogonal to each other, and the light-shielding portion or the light-transmitting portion is orthogonal to each other. However, even if they are arranged at regular intervals in the direction in which light is transmitted, a light amount correction filter that accurately reproduces a desired light transmittance distribution can be obtained.

Embodiment 4 FIG. In the third embodiment, the size of the light-shielding portion or light-transmitting portion made of rectangular dot-shaped small sections is fixed and arranged at regular intervals in directions orthogonal to each other. Even if the length of the light-shielding portion or the light-transmitting portion is constant in a direction orthogonal to each other, and the interval between the light-shielding portions or the light-transmitting portions of this fixed length is steplessly changed in the direction orthogonal to each other, the array is A light amount correction filter that accurately reproduces a desired light transmittance distribution can be provided.

Embodiment 5 FIG. In each of the above embodiments, the light amount correction filter in which the light-shielding portion or the light-transmitting portion is formed of rectangular dot-shaped small sections has been described. Even if arranged in the direction,
Similarly, a light amount correction filter that accurately reproduces a desired light transmittance distribution can be provided.

In this case, the lengths Dx (X, Y) and Dy (X, Y) of the light shielding portion or the light transmitting portion in the x-axis and y-axis directions.
Is Dx (X, Y) = Dy (X, Y) = D (X, Y), and the light transmittance T at an arbitrary position of the light amount correction unit is obtained.
(X, Y) is expressed by Equation 19 when the square dot-shaped small section is a light-shielding section, and is expressed by Equation 20 when it is a light-transmitting section.

[Equation 19]

(Equation 20)

In the above-described embodiment, the light-amount correction filter in which the light-shielding portion or the light-transmitting portion is a rectangular or square dot-shaped small section and the light-shielding portion or the light-transmitting portion is arranged in a direction orthogonal to each other has been described. The light shielding portion or the light transmitting portion can be a light amount correction filter that accurately reproduces a desired light transmittance distribution even if it is continuous in at least one of the directions orthogonal to each other.

[0036]

According to the present invention, a light-shielding portion or a light-transmitting portion composed of a large number of small sections is formed continuously or discontinuously on a light-transmitting substrate, and a light-transmitting portion is formed between the light-shielding portions or a light-shielding portion is formed between the light transmitting portions. A light-transmitting substrate represented by xy orthogonal coordinates in a fluorescent light amount correcting filter for forming a fluorescent screen of a color picture tube that obtains a desired transmitted light amount distribution by changing the area ratio between the light-shielding portion and the light-transmitting portion. The distances in the x-axis and y-axis directions of the adjacent light-shielding portion or light-transmitting portion at the arbitrary positions X and Y above are Px (X, Y) and Py (X, Y), respectively, and the x-axis direction of the light-shielding portion or light-transmitting portion. And the length in the y-axis direction are Dx
(X, Y), Dy (X, Y), and m and n are 1, 2,
Positive integers consisting of 3,..., M1, M2, M3, M4, N
1, N2, N3, N4 are each an arbitrary positive integer, α
When mn, βmn, γmn, and δmn are coefficients, Px (X,
Y), Py (X, Y), Dx (X, Y), Dy (X,
Y) is expressed by Equations 7 to 10 (Equations 1 to 4), and when the light transmittance at an arbitrary position X, Y is T (X, Y), when the small section is a light transmitting portion, Equation 11 (Equation 5) If the small section is a light-shielding portion, a light amount correction filter represented by Expression 12 (Equation 6) can quantitatively and accurately control the size or interval of the light-shielding portion or the light transmitting portion, and Since it has a high degree of freedom, it can be easily designed. In designing such a light amount correction filter, both the size and the interval of the small section in the x and y directions may be changed, or at least one of them may be changed and the other may be fixed. Due to the penumbra effect caused by not being a light source, the size and spacing of the small sections required to eliminate the shadow of the light shielding part on the inner surface of the panel, the distance from the exposure light source to the light amount correction filter and the distance to the phosphor screen Is maintained, and a light amount correction filter having a desired light transmittance distribution can be freely obtained.

A light amount correction filter is arranged on the light source.
And the light emitted from the light source
Phosphor-forming member layer formed on the inner surface of the panel by light
Pattern corresponding to the electron beam passage hole in the shadow mask
In the method of exposing a phosphor screen of a color picture tube for printing
On the light source, the light amount correction field for forming the fluorescent screen of the color picture tube
A phosphor layer forming member layer by arranging one or more luters
Pattern corresponding to the electron beam passage hole in the shadow mask
Baking, the gaps between the light absorbing layers and the three-color phosphor layer
The size can be controlled accurately and the white uniformity is good.
A good color picture tube can be obtained.

[Brief description of the drawings]

FIG. 1A is a plan view of a light amount correction filter for forming a fluorescent screen of a color picture tube according to a first embodiment of the present invention, and FIG.
(B) is an enlarged view of the light amount correction unit.

FIG. 2A is a plan view of a light amount correction filter for forming a fluorescent screen of a color picture tube according to a second embodiment of the present invention;
(B) is an enlarged view of the light amount correction unit.

FIG. 3 is a diagram showing a configuration of a color picture tube.

FIG. 4A is a plan view showing a structure of a fluorescent screen of a color picture tube comprising a dot-shaped phosphor layer, and FIG. 4B is a sectional view thereof.

FIG. 5A is a plan view showing a structure of a phosphor screen of a color picture tube comprising a stripe-shaped phosphor layer, and FIG. 5B is a cross-sectional view thereof.

6A is a plan view showing a structure of a black matrix type phosphor screen, and FIG. 6B is a cross-sectional view thereof.

FIG. 7A is a plan view showing a structure of a black stripe type fluorescent screen, and FIG. 7B is a sectional view thereof.

FIGS. 8A to 8I are diagrams illustrating a method of forming a fluorescent screen of a color picture tube formed using the light amount correction filter.

FIG. 9 is a view showing a configuration of a conventional exposure apparatus used for forming a fluorescent screen of a color picture tube.

[Explanation of symbols]

 30: Light transmitting substrate 31: Light intensity correction unit 32: Light shielding unit 33: Light transmitting unit

(56) References JP-A-52-42739 (JP, A) JP-A-54-22844 (JP, A) JP-A-63-138628 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) H01J 9/227

Claims (2)

(57) [Claims] 1. A light-shielding portion or light-transmitting portion comprising a large number of small sections is formed continuously or discontinuously on a light-transmitting substrate. A light-shielding portion between the light-transmitting portions made of the light-transmitting portions, and changing the area ratio between the light-shielding portion and the light-transmitting portion to obtain a desired transmitted light amount distribution. The intervals in the x-axis and y-axis directions of the adjacent light-shielding portions or light-transmitting portions at arbitrary positions X and Y on the light-transmitting substrate represented by coordinates are Px (X, Y) and Py, respectively.
(X, Y), the lengths of the light shielding portion or the light transmitting portion in the x-axis and y-axis directions are Dx (X, Y) and Dy, respectively.
(X, Y), m and n are positive integers consisting of 1, 2, 3,..., M1, M2, M3, M4, N1, N2, N3, N
4 is any positive integer, αmn, βmn, γmn, δ
When mn is a coefficient, the above Px (X, Y), Py (X,
Y), Dx (X, Y ) and Dy (X, Y) are given by the following equations ( 1 ) to ( 4). (Equation 2) (Equation 3) (Equation 4) And the light transmittance at the arbitrary positions X and Y is T
When (X, Y) is used, the following equation (5) when the small section is the light transmitting section, and the following equation (6) when the small section is the light shielding section: (Equation 6) A light amount correction filter for forming a fluorescent screen of a color picture tube, characterized by being represented by: 2. A light amount correction filter is arranged on a light source,
A phosphor screen exposure method for a color picture tube for printing a pattern corresponding to an electron beam passage hole of a shadow mask on a phosphor screen forming member layer formed on the inner surface of the panel by light emitted from the light source through the light quantity correction filter. 2. A fluorescent screen forming light amount correction filter according to claim 1, which is disposed on said light source, wherein one or a plurality of fluorescent screen forming light amount correcting filters correspond to electron beam passing holes of a shadow mask in said fluorescent screen forming member layer. The pattern to be printed
A phosphor screen exposure method Luke color picture tube.