JP2626122B2 - Method of manufacturing black matrix phosphor screen for color picture tube - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a phosphor screen black matrix film of a color picture tube.

[Prior Art] Generally, in order to improve contrast, a black matrix type color picture tube is formed by filling a space between phosphor pixels of green, blue and red with a non-light-emitting and light-absorbing substance such as graphite to form a phosphor screen. I have. The film formed of the non-light-emitting and light-absorbing substance is called a black matrix film. The method for forming this film is as follows.

First, after washing the inner surface of the glass panel with hydrofluoric acid and pure water, a photosensitive resin solution containing polyvinyl alcohol and ammonium dichromate or a photosensitive resin solution containing polyvinylpyrrolidone and a bisazide compound on the inner surface. Is applied, and the photosensitive resin film is uniformly extended and formed by rotating the glass panel at a high speed. Next, after the photosensitive resin film is dried by a far-infrared heater and a blower arranged opposite to the glass panel, a shadow mask is attached, and the substrate is transferred to an exposure device by a suction transfer device. The surface temperature of the suction pad of the suction transfer device before transferring the glass panel to the exposure apparatus is 20 to 21 ° C., the same as room temperature, and the surface temperature of the transferred glass panel is heated by a far-infrared heater. It is 35-50 degrees Celsius. In addition, black natural rubber is used for the suction pad, and absorbs heat from the glass panel during exposure and transfer. Next, in an exposure apparatus, exposure is performed by ultraviolet light using an ultra-high pressure mercury lamp as a light source, and a part of the photosensitive resin film is photosensitive-cured. At this time, the cured resin film that has been photosensitive-cured is located at a position where green, blue, and red phosphor pixels are formed later, and three times of exposure is usually performed by changing the relative position of the glass panel and the light source. Next, remove the shadow mask,
When developed with warm water, only the cured resin film that has been photosensitive and cured remains on the inner surface of the panel. Next, a graphite suspension was applied to the entire inner surface of the panel and dried to form a graphite film, which was then immersed in a hydrogen peroxide solution to swell the photo-cured cured resin film, and was applied thereon by hot water spray. It is removed together with the graphite film to form a black matrix film on the inner surface of the glass panel. Next, green, blue, and red phosphor pixels are formed at respective positions of the black matrix holes, a filming solution is applied and dried so that the aluminum film is smooth, and then an aluminum film is formed by vacuum evaporation. Then, the filming film is burned off by the heat treatment to complete the fluorescent screen of the color picture tube.

[Problems to be solved by the invention]

However, in the above-described conventional method for manufacturing a phosphor screen black matrix film of a color picture tube, when the glass panel is transferred to the exposure apparatus, the surface temperature of the suction pad of the suction transfer apparatus and the temperature of the glass panel in contact with the suction pad are reduced. Since the temperature difference from the surface temperature is 14 to 30 degrees Celsius, the heat of the glass panel in the area of contact with the suction pad is absorbed by the suction pad,
At the same time as the glass panel is cooled, the photosensitive resin film is also cooled, absorbing moisture in the air and increasing the sensitivity. Therefore, when exposed to ultraviolet light through a shadow mask, the area where the suction pad did not contact The size of the photosensitive curable dot is larger than that of the above. That is, when the black matrix film is formed, the area of the black matrix hole in the portion where the suction pad is in contact becomes larger than the area where the suction pad is not in contact, and the white ring-shaped film unevenness as shown in FIG. In the case where the fluorescent screen is caused to emit light as a galler picture tube, a bright annular portion is generated on the fluorescent screen, whereby white uniformity cannot be obtained, which has been a major problem in product quality.

[Means for solving the problem]

The present invention relates to a black matrix type color picture tube in which three kinds of phosphor pixels of green, blue and red formed on the inner surface of a glass panel and a phosphor screen are formed by filling a space between the phosphor pixels with a non-light-emitting and light-absorbing substance. In the method of manufacturing a phosphor screen black matrix film of, forming a photosensitive resin film on the inner surface of the glass panel,
When a shadow mask is attached and transferred to the exposure apparatus, the glass panel is attracted by a contact formed of a heat insulating and heat reflective material and transferred to the exposure apparatus.

〔Example〕

Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a first embodiment of the present invention before exposure transfer.
First, after cleaning the inner surface of the glass panel 1 with hydrofluoric acid and pure water, a photosensitive resin solution having a composition of polyvinylpyrrolidone and a bisazide compound is applied to the inner surface, and the glass panel 1 is rotated at a high speed to obtain a photosensitive property. After drying the resin film, the shadow mask 2 is attached. Next, as shown in FIG. 1, the glass panel 1 is sucked by the suction pad 4 formed of white natural rubber, and transferred to the exposure apparatus. Next, in an exposure apparatus, exposure is performed by ultraviolet light using an ultra-high pressure mercury lamp as a light source, and a part of the photosensitive resin film is photosensitive-cured. At this time, the cured resin film which has been photosensitive-cured is located at a position where green, blue, and red phosphor pixels are to be formed later, and the exposure is performed three times while changing the relative position between the glass panel and the light source. Next, when the shadow mask is removed and development processing is performed with warm water, only the cured resin film that has been photosensitive and cured remains on the inner surface of the panel. Next, a graphite suspension is applied to the entire inner surface of the panel and dried to form a graphite film. Then, the graphite film is immersed in a hydrogen peroxide solution to swell the cured photo-cured resin film. The film was removed together with the film, and a good black matrix film without film unevenness could be formed on the inner surface of the glass panel.

In this embodiment, since the suction pad made of white natural rubber is used, the heat of the glass panel is reflected well, so that a black matrix film without film unevenness can be formed.

FIG. 2 is a longitudinal sectional view of a second embodiment of the present invention before exposure transfer. Instead of forming the suction pad with white natural rubber, it is formed of silver-colored polyethylene, and by reflecting the heat of the glass panel, it is possible to form a good black matrix film without film unevenness as in the first embodiment. did it.
In this embodiment, there is an advantage that heat insulation and heat reflection are better than white natural rubber.

〔The invention's effect〕

As described above, the method for manufacturing the phosphor screen black matrix film of the color picture tube according to the present invention includes the step of transferring the glass panel to the exposure apparatus by using a contact formed of a heat insulating and heat reflective material. It is possible to form a good black matrix film which does not cause white ring-shaped film unevenness, and has an effect of improving the quality of white uniformity of a color picture tube.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a transfer machine and a glass panel before exposure transfer according to a first embodiment of the present invention, and FIG. 2 is a transfer machine and glass before exposure transfer according to a second embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a conventional transfer machine and a glass panel before exposure transfer, and FIG. 4 is a view showing a white ring-shaped film unevenness. 1 ... Glass panel, 2 ... Shadow mask, 3 ... Transfer machine arm, 4 ... Suction pad made of white natural rubber, 5 ... Suction pad made of silver polyethylene, 6 ... Suction pad made of black natural rubber, 7
... Black matrix film, 8 ... White ring-shaped film unevenness.

Claims (1)

(57) [Claims] 1. A black matrix type color image receiving apparatus in which three kinds of phosphor pixels of green, blue and red formed on the inner surface of a glass panel and a phosphor screen are formed by filling a space between the phosphor pixels with a non-light-emitting and light-absorbing substance. In a method of manufacturing a fluorescent screen black matrix film of a tube, a photosensitive resin film is formed on an inner surface of a glass panel,
A fluorescent screen black matrix film for a color picture tube, wherein a glass mask is attached to a shadow mask and the glass panel is sucked by a contact hand formed of a heat-insulating and heat-reflective material when the glass panel is transferred to the exposure apparatus. Manufacturing method.