JPH02276131A - Manufacture of fluorescent screen black matrix film for color image receiving tube - Google Patents

Abstract

PURPOSE:To form a fluorescent screen black matrix film of a color image receiving tube with a large faceplate easily by irradiating the ultra-violet ray intermittently emitted to a photosensitive resin film formed on the inside surface of a glass panel, and exposing. CONSTITUTION:To photosensitive resin liquid which consists of polyvinyl pyrrolidone and azide and painted on the inside surface of a glass panel 1 at 32 inches is expanded evenly over the inside surface of the glass panel by rotating for overshooting, and thereafter, it is dried by a far infrared heater. Next, a shadow mask 3 is fitted, and the ultra-violet ray having a peak illuminance of the inside surface of the glass panel 1 at 130muW/cm<2>, a width of light-emitting time at 5m sec, and an interval at 5m sec and emitting the light intermittently is irradiated to a photosensitive resin film 2 with an exposing device which consists of an extra-high pressure mercury lamp, and the exposure is performed three times with green, blue and red by changing a relative position of a light source and the panel. After a part of the photosensitive resin film 2 is thereby exposed for hardening, a black matrix film is formed on the inside surface of the glass panel 1 through processes of development, graphite paint and etching.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a phosphor black matrix film for a color picture tube.

[Conventional technology]

Generally, in a black matrix type color picture tube, a phosphor screen is formed by filling the spaces between green, blue, and red phosphor pixels with a non-light-emitting light-absorbing material, such as graphite, in order to improve contrast. A film formed of this non-light-emitting light-absorbing substance is called a black matrix film, and the following methods are available for forming this film.

First, the inner surface of the glass panel is cleaned with hydrofluoric acid and pure water, and then a photosensitive resin liquid whose composition is polyvinyl alcohol and ammonium dichromate, or a photosensitive resin liquid whose composition is polyvinylpyrrolidone and azide is applied to the inner surface. The glass panel is rotated at high speed to uniformly spread the photosensitive resin film.After drying the photosensitive resin film using a far-infrared heater and blower placed opposite the glass panel, the inner surface of the glass panel is A portion of the photosensitive resin film 2 is photocured by exposing it to ultraviolet light from a continuously emitting ultra-high pressure mercury lamp 6 as shown in FIG. 3 through a shadow mask placed a certain distance apart. let At this time, the photosensitive cured resin film is located at a position where green, blue, and red color phosphor pixels will be formed later, and exposure is usually performed three times by changing the relative position of the glass panel and the light source.

Next, the shadow mask is removed and developed with warm water, leaving only the photosensitive hardened resin film on the panel's inner surface.Next, a graphite suspension is applied to the entire panel's inner surface, dried to form a graphite film, and then peroxidized. The photosensitive cured resin film is swollen by immersion in hydrogen water, and then removed together with the graphite film deposited thereon by hot water spray to form a black matrix film on the inner surface of the glass panel.

Next, green, blue, and red phosphor pixels are formed at each position of the black matrix hole, and a filming film is applied so that the aluminum film is smooth, and then an aluminum film is formed by vacuum evaporation. The filming film is burnt out by heat treatment, and the phosphor screen of the color picture tube is completed.

[Problem to be solved by the invention]

However, in the above-described conventional method for manufacturing a phosphor black matrix film for a color picture tube, when manufacturing a phosphor black matrix film for a large screen color picture tube of 20 inches or more, glass is removed in the process of exposing a photosensitive resin film. The peak illuminance per unit area on the inner surface of the panel was less than the required illuminance, making it difficult to form a black matrix film with a desired black matrix hole diameter.

In particular, the photosensitive resin liquid whose composition is polyvinylpyrrolidone and azide has a reciprocity law failure property, that is, it does not cause a curing reaction even if the exposure time is prolonged with weak light below the standard value. The peak illuminance per unit area on the inner surface of the glass panel must exceed a standard value, and a light source that emits strong ultraviolet light is required. Therefore, the power applied to the ultra-high pressure mercury lamp is increased,
Although we tried to extract strong ultraviolet light, the inner wall of the glass tube of the ultra-high pressure mercury lamp is constantly exposed to high temperatures, so it takes about 30 minutes after lighting.
The drawback was that the ultra-high pressure mercury lamp would be destroyed within minutes, greatly reducing the productivity of large-screen color picture tubes.

[Means to solve the problem]

The method of manufacturing a phosphor black matrix film for a color picture tube according to the present invention is carried out by irradiating a photosensitive resin film formed on the inner surface of a glass panel with flashing ultraviolet light. In other words, by continuing to emit light from an ultra-high-pressure mercury lamp for a certain period of time every certain cycle, even if a large amount of power is applied to the ultra-high-pressure mercury lamp, the inner wall of the glass tube of the ultra-high-pressure mercury lamp will be cooled while the light emission is stopped, and abnormalities will not occur. The ultra-high-pressure mercury lamp is exposed to high temperatures, so it does not break down in a short period of time, and there is a process of exposing the glass panel so that the peak illuminance per unit area on the inner surface of the glass panel is higher than a reference value.

〔Example〕

Next, a first embodiment of the present invention will be described with reference to the drawings.

First, a photosensitive resin liquid consisting of polyvinylpyrrolidone and azide is applied to the inner surface of a 32-inch glass panel 1, and then spread uniformly over the inner surface of the glass panel by rotary shaking, and then dried with a far-infrared heater to create a zero-order shadow. The mask 3 is attached, and the inner surface of the glass panel 1 is exposed to flashing ultraviolet light with a peak illuminance of 130 (μW/cm2), a light emission time width of 5 (msec), and an interval of 5 (msec) using the exposure apparatus shown in Fig. 1. Apply to resin film 2 for 25 seconds and turn green.

Exposure was performed three times for blue and red by changing the relative position of the light source and panel. Note that a voltage shown in an AC step voltage waveform 12 generated by an inverter 11 was applied to the ultra-high pressure mercury lamp 6 via a step-up transformer 10. In this way, photosensitive resin II! After a part of the glass panel 2 was photocured, a black matrix film was formed on the inner surface of the glass panel 1 through a process of development, graphite coating, and etching.

FIG. 2 is a longitudinal cross-sectional view explaining a second embodiment of the present invention and a power supply circuit diagram for making an ultra-high pressure mercury lamp emit light.
In this embodiment, the center clipper 14 was used to create a step voltage waveform to be applied to the ultra-high pressure mercury lamp 6. This embodiment has the advantage that the device can be manufactured relatively inexpensively compared to using an inverter. Using this apparatus, exposure was performed by intermittent lighting in the same manner as in the first example, to obtain a desired black matrix film.

〔Effect of the invention〕

As explained above, the method for manufacturing a phosphor black matrix film for a color picture tube according to the present invention involves exposing a photosensitive resin film formed on the inner surface of a glass panel to flashing ultraviolet light. It becomes possible to obtain strong ultraviolet light that could not be obtained conventionally from an ultra-high-pressure mercury lamp, and in particular, it has the effect of easily forming a black matrix film on the phosphor screen of a large-screen color picture tube.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view for explaining the first embodiment of the present invention, and a power supply circuit diagram for making an ultra-high pressure mercury lamp emit light;
FIG. 2 is a longitudinal cross-sectional view for explaining a second embodiment of the present invention, and a power supply circuit diagram for making an ultra-high pressure mercury lamp emit light;
FIG. 3 is a longitudinal sectional view of an exposure device in a conventional method for manufacturing a phosphor black matrix film of a color picture tube, and a power supply circuit diagram for making an ultra-high pressure mercury lamp emit light. 1...Glass panel, 2...Photosensitive resin film, 3...
・Shadow mask, 4... Light control filter, 5... Correction lens, 6... Ultra high pressure mercury lamp, 7... Slit,
8... Lamp house, 9... Cooling water, 10... Step-up transformer, 11... Inverter, 12... Step voltage waveform generated by the inverter, 13... AC power supply, 14...・Center clipper 15... AC step voltage waveform generated by the center clipper, 16
...Step-up transformer, 17...AC voltage waveform.

Claims (1)

[Claims] The black matrix film on the phosphor screen of a color picture tube has three types of phosphor pixels of green, blue, and red formed on the inner surface of the glass panel, and the space between each phosphor pixel is filled with a non-emissive light-absorbing material to form the phosphor screen. Manufacturing a phosphor screen black matrix film for a color picture tube, the manufacturing method comprising a step of exposing a photosensitive resin film formed on the inner surface of a glass panel to flashing ultraviolet light. Method.