JPH09199023A - Exposure device for color crt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust illumination for exposure relating to a PVA(polyvinyl alcohol) coating film or PVP(polyvinyl pyroliron) coating film by eliminating necessity for replacement of an exposure light source. SOLUTION: In an exposure device exposing photosensitive coating film 6 formed in an internal surface to a face panel 8 of a color CRT through a slit of an aperture grille 7 as the preceding process in the case of forming a carbon stripe in a panel internal surface of the color CRT, by only replacing an illumination correcting filter 93 of a correction lens system 9 with an illumination correction filter of ultraviolet-ray permeability suited for exposure of a PVA(polyvinyl alcohol) coating film or PVP(polyvinyl propyliron) coating film, the exposure device is set for exposure of the PVA or PVP coating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color CRT exposure apparatus, and in particular, in forming a carbon stripe on the inner surface of a color CRT panel, a photosensitive coating formed on the inner surface of the color CRT panel is used as a pre-process. The present invention relates to an exposure device that exposes light through a slit of an aperture grill.

[0002]

2. Description of the Related Art In a color CRT, vertical stripe carbon stripes are formed on the inner surface of the panel at intervals of 0.25 mm to improve the contrast of the fluorescent screen. When forming such a carbon stripe on the inner surface of the panel of the CRT, as a pretreatment step, the PVA photosensitive solution or PV is applied to the inner surface of the panel after cleaning.
A photosensitive coating film is formed by applying P photosensitive solution, and after setting the aperture grill in the panel, the ultraviolet rays passing through the correction lens system from the mercury lamp through the aperture grill are photosensitive coating film. To expose the photosensitive coating film. Next, after removing the aperture grill,
The unexposed portion of the photosensitive coating film is removed, and the process proceeds to the carbon stripe forming step.

This type of conventional color CRT exposure apparatus is
As shown in FIG. 4, an exposure table body 1, a panel shifter 2 arranged above the exposure table body 1, an exposure light source 3 installed in the lower part of the exposure table body 1, and an optical axis above the exposure light source 3. And a correction lens system 4 for diffusing ultraviolet rays emitted from a ray emission opening 3C formed on the upper surface of the lamp house 3B so as to irradiate the entire inner surface of the panel. It is composed of a light-shielding plate 5 arranged between the panel shifters 2 so as to be openable and closable. A photosensitive coating 6 such as PVA is formed on the inner surface of the panel shifter 2 and an aperture grill 7 is attached to the color CRT. A face panel 8 is placed. The exposure light source 3
Consists of a lamp house 3B whose upper opening is sealed with quartz glass 3A and a mercury lamp 3C installed in the lamp house 3B. The lamp house 3B is filled with cooling water 3D for cooling the mercury lamp 3C. This cooling water 3
D is configured to be circulated and cooled by a cooling unit (not shown), and a light exit aperture 3E having a predetermined opening area is formed in the quartz glass 3A by means such as masking. A shutter 5A is provided on the front surface of the exposure light source 3.

The correction lens system 4 includes a flat lens 41,
It is composed of a main lens 42, an illuminance correction filter 43, a side lens 44, a sub lens 45, and the like, and these respective lenses are integrally assembled to the lens frame 46 with their optical axes aligned. The exposure light beam emitted from the correction lens system 4 toward the inner surface of the panel is determined in accordance with the incident angle of the electron beam on the inner surface of the face panel. The main lens 42, the side lens 44, and the sub lens 45 of the correction lens system 4 are designed and processed. Further, the illuminance correction filter 43 is made to have a transmittance distribution having a characteristic of a paraboloid of rotation according to the curvature of the inner surface of the panel by using a vapor deposition method or a photographic method, and the photosensitive coating film 6 is provided through the aperture grille 7. It has a function of setting the light amount for exposing to a proper value.

By the way, the photosensitive coating film used in the pretreatment process for forming a carbon stripe on the inner surface of the panel includes a PVA coating film and a PVP coating film.
The ultraviolet ray illuminance for exposing the P coating film needs to be about 40% lower than the exposure illuminance of the PVA coating film. This is because when the PVP coating film is exposed to the same illuminance as the PVA coating film, the contour during carbon stripe formation becomes unclear,
As a result, the contrast ratio of the phosphor screen is lowered.

Therefore, conventionally, the aperture ratio of the light exit opening 3E of the exposure light source 3 is set for the PVA coating film and the PVP coating film, and the exposure light source 3 is adjusted according to the PVA coating film or the PVP coating film. I am going to exchange it. By the way, PV
The light exit opening 3E of the lamp house 3B for exposing the A coating film is set to a size of 26 mm × 16 mm, and the light exit opening 3E for exposing the PVP coating film is 16 m.
The size is set to m × 16 mm.

[0007]

However, in the conventional exposure apparatus as described above, the exposure light source itself is exchanged in accordance with the PVA coating film or the PVP coating film. Since it is necessary to remove the piping for power supply, power supply wiring, etc. from the exposure light source, it takes a lot of time for replacement work, and it also takes much time to align the position of the exposure light source after replacement with the optical axis of the correction lens system. There was a problem that labor was required. The present invention has been made in view of the above points, and provides a color CRT exposure apparatus that does not require replacement of an exposure light source and can easily adjust the exposure illuminance for a PVA coating film or a PVP coating film. With the goal.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a method for forming a carbon stripe on the inner surface of a panel of a color CRT, as a pre-step of forming the color CRT.
An exposure device for exposing a photosensitive coating film formed on an inner surface of a panel of an RT through a slit of an aperture grill, wherein an ultraviolet ray for exposing the photosensitive coating film is applied to an inner surface of the panel from an opening having a predetermined aperture ratio. An exposure light source that illuminates
A correction lens system that diffuses the ultraviolet rays emitted from the opening of the exposure light source so that the entire inner surface of the panel is irradiated.
An illuminance correction filter that is arranged at an appropriate position of the correction lens system and that adjusts the transmittance of ultraviolet rays that pass through the correction lens system according to the physical properties of the photosensitive coating film, and the illuminance correction filter is made photosensitive. It can be replaced according to the physical properties of the coating film.

In the present invention, the photosensitive coating film is PVA.
It is formed by applying a (polyvinyl alcohol) photosensitive solution or a PVP (polyvinylpyrrolilone) photosensitive solution. In the present invention, the illuminance correction filter forms a carbon stripe in a grid shape on the surface facing the exposure light source in accordance with the curved shape of the inner surface of the panel, so that the UV light having an illuminance suitable for the PVA photosensitive coating film. It is characterized in that the light transmittance can be obtained. In the present invention, the illuminance correction filter is configured such that a carbon stripe is formed in a lattice shape on a surface facing the exposure light source in accordance with a curved shape of a panel inner surface, and a metal is provided on a surface opposite to the surface facing the exposure light source. By vapor-depositing a thin film, it is possible to obtain an ultraviolet ray transmittance having an illuminance suitable for the PVP photosensitive coating.

According to the present invention, which has the above configuration,
PVA coating or PVP applied to the inner surface of the face panel
Only the illuminance correction filter needs to be replaced according to the coating film, and the exposure light source can be an exposure light source with one type of light exit aperture ratio suitable for the exposure of the PVA coating film, and there is no need to replace the exposure light source. The exposure apparatus can be easily set for exposure of the PVA coating film or the PVP coating film only by exchanging the correction filter.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a color CRT exposure apparatus according to the present invention.
The same components as those in FIG. 4 are described with the same reference numerals.
In FIG. 1, an exposure apparatus for exposing a PVA coating film or a PVP coating film for forming a carbon stripe on an inner surface of a face panel 8 is an exposure table body 1, and this exposure table body 1
A panel shifter 2 disposed above the exposure light source, an exposure light source 3 disposed below the exposure base body 1, and a light beam disposed above the exposure light source 3 with their optical axes aligned with each other and formed on the upper surface of the lamp house 3B. A correction lens system 9 for diffusing the ultraviolet rays emitted from the emission opening 3E so that the entire inner surface of the panel is irradiated, and a shading plate 5 that is openably and closably disposed between the correction lens system 9 and the panel shifter 2. On the panel shifter 2, a face panel 8 of a color CRT having a photosensitive coating film 6 formed by applying a PVA photosensitive solution or a PVP photosensitive solution on the inner surface of the panel and having an aperture grill 7 mounted thereon is placed. ing. The exposure light source 3 has the same structure as that shown in FIG.

The correction lens system 9 includes a flat lens 91,
A main lens 92, an illuminance correction filter 93, a side lens 94, a sub lens 95, and the like are provided, and these lenses are arranged in a stacked state with their optical axes aligned from the exposure light source 3 side to the face panel 8 side. Among these lenses, the flat lens 91 and the main lens 92 are integrally assembled to the lens frame 96 with their optical axes aligned, and the side lens 94 and the sub-lens 95 are integrated with their lens frame 97 aligned with their optical axes. Is installed in. Further, the illuminance correction filter 93 is replaceably arranged between the flat lens 91 and the side lens 94, and includes a lens frame 96,
It is attached to a single lens frame 98 separated from 97, so that the illuminance correction filter 93 can be replaced according to the PVA coating film or PVP coating film to be exposed.

Of the replaceable illuminance correction filters 93, the illuminance correction filter 93A for obtaining the ultraviolet ray transmittance of the illuminance suitable for the PVP photosensitive coating is made of a glass disk, and its upper surface, that is, the exposure light source 3 is used. As shown in FIG. 2, a metal thin film 10 made of chromium or the like is formed on the surface opposite to the surface facing the
Is formed by vapor deposition, and carbon stripes 11 are formed in a grid pattern on the lower surface thereof, that is, the surface facing the exposure light source 3, in accordance with the curved shape of the inner surface of the face panel (see FIG. 3). Further, an illuminance correction filter 9 for obtaining an ultraviolet ray transmittance having an illuminance suitable for the PVA photosensitive coating film.
3B is made of a glass disk, and its lower surface, that is, the exposure light source 3
As shown in FIG. 3, carbon stripes 11 are formed in a lattice pattern on the surface facing the inner surface of the face panel in accordance with the curved surface shape of the inner surface of the face panel.

When the PVP photosensitive coating 8 formed on the inner surface of the face panel 7 is exposed in the exposure apparatus configured as described above, the illuminance correction filter 93 of the correction lens system 9 is set to the illuminance shown in FIG. Replace with the correction filter 93A. In this state, the ultraviolet ray emitted from the ray emission opening 3E of the exposure light source 3 and incident on the correction lens system 9 is reduced to 50 to 70% of that of the PVA photosensitive coating film by the illuminance correction filter 93A. This provides an illuminance suitable for exposing the PVP photosensitive coating. In addition, the ultraviolet rays corrected by the correction lens system 9 are used for the aperture grill 7
By irradiating the PVP photosensitive coating on the inner surface of the panel via
The portion of the aperture grill 7 facing the slit is exposed.

When exposing the PVA photosensitive coating 8 formed on the inner surface of the face panel 7, the illuminance correction filter 93 of the correction lens system 9 is replaced with the illuminance correction filter 93B shown in FIG. In this state, the ultraviolet ray emitted from the light ray emission opening 3E of the exposure light source 3 and incident on the correction lens system 9 has an illuminance suitable for the exposure of the PVA photosensitive coating film by the illuminance correction filter 93B. Further, if the PVA photosensitive coating film on the inner surface of the panel is irradiated with the ultraviolet rays corrected by the correction lens system 9 through the aperture grille 7, the portion of the aperture grille 7 facing the slit is exposed.

As described above, according to this embodiment, the illuminance correction filter of the correction lens system 9 is replaced by the illuminance correction filter 93A.
Alternatively, the exposure apparatus can be simply set for exposure of the PVA coating film or PVP coating by simply replacing it with 93B, and the exposure light source has one kind of light emission aperture ratio suitable for exposure of the PVA coating film. The exposure light source is sufficient, there is no need to replace the exposure light source as in the conventional case, and its position adjustment is also unnecessary.

[0017]

As described above, according to the present invention, the color C
An exposure apparatus for exposing a photosensitive coating film formed on the inner surface of a panel of a color CRT through a slit of an aperture grill as a pre-process when forming a carbon stripe on the inner surface of an RT panel. An exposure light source for irradiating an ultraviolet ray for exposing the inner surface of the panel from an opening having a predetermined aperture ratio, and a correction lens for diffusing the ultraviolet ray emitted from the opening of the exposure light source so that the entire inner surface of the panel is irradiated. System and an illuminance correction filter that is arranged at an appropriate position of the correction lens system and adjusts the transmittance of ultraviolet rays that pass through the correction lens system according to the physical properties of the photosensitive coating film. Can be replaced according to the physical properties of the photosensitive coating film. Therefore, the exposure apparatus can be easily set for exposure of the PVA coating or the PVP coating simply by exchanging the illuminance correction filter of the correction lens system, and the exposure light source is one type suitable for the exposure of the PVA coating. Since the exposure light source having the light emission aperture ratio of 1 is sufficient, there is no need to replace the exposure light source as in the conventional case, and the position adjustment is also unnecessary.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a color CRT exposure apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of an illuminance correction filter according to the embodiment of the present invention.

FIG. 3 is a perspective view showing another example of the illuminance correction filter according to the embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a color CRT exposure apparatus in a conventional example.

[Explanation of symbols]

 1 main body of exposure table 3 exposure light source 3E light emitting aperture 6 photosensitive coating 7 aperture grille 8 face panel 9 correction lens system 10 metal thin film 11 carbon stripe 93, 93A, 93B illuminance correction filter

Claims (4)

[Claims] 1. An exposure apparatus which exposes a photosensitive coating film formed on the inner surface of a panel of a color CRT through a slit of an aperture grill, as a pre-step when forming a carbon stripe on the inner surface of a panel of a color CRT. An exposure light source for irradiating the photosensitive coating with an ultraviolet ray toward the panel inner surface from an opening having a predetermined aperture ratio; and an ultraviolet ray emitted from the exposure light source opening for irradiating the entire panel inner surface. A correction lens system that diffuses as described above, and an illuminance correction filter that is arranged at an appropriate position of the correction lens system and that adjusts the transmittance of the ultraviolet ray that passes through the correction lens system according to the physical properties of the photosensitive coating film. An exposure apparatus for a color CRT, characterized in that the illuminance correction filter can be replaced according to the physical properties of the photosensitive coating film. 2. The color CRT exposure apparatus according to claim 1, wherein the photosensitive coating film is formed by applying a PVA (polyvinyl alcohol) photosensitive solution or a PVP (polyvinylpyrrolilon) photosensitive solution. 3. The PV of the illuminance correction filter is formed by forming carbon stripes in a lattice shape on the surface facing the exposure light source in accordance with the curved shape of the inner surface of the panel.
An exposure apparatus for a color CRT according to claim 1 or 2, wherein an ultraviolet ray transmittance having an illuminance suitable for the photosensitive film A is obtained. 4. The illuminance correction filter has carbon stripes formed in a grid pattern on a surface facing the exposure light source in accordance with a curved shape of an inner surface of the panel, and a metal on a surface opposite to the surface facing the exposure light source. By depositing a thin film,
3. The color CRT exposure apparatus according to claim 1, wherein an ultraviolet ray transmittance having an illuminance suitable for the PVP photosensitive coating film is obtained.