JPS63138628A - Exposer for color picture tube - Google Patents

Abstract

PURPOSE:To make the occurrence of chromatic aberration in a screen peripheral part smaller and deflecting yoke adjustments easier, by forming a correction filter with a combination of plural filters different in each transmissivity at the central part and the peripheral part respectively. CONSTITUTION:In this device, there is provided with a correcting filter which is set up between a correcting lens 4 and a panel mount 2 and constituted of a combination of plural filters such as a first correcting filter 5a and a second correcting filter 5b or the like difference in each transmissivity at the central part and the peripheral part respectively. Therefore, a quantity of light at the time of exposing a panel 1 of a color picture tube to light can be varied according to the panel part. With this constitution, the quantity of light exposed to the area other than a display area of the panel peripheral part is reduced, whereby size of a black matrix to be formed in this area is made smaller, thus such a color picture tube that is less in the occurrence of chromatic aberration in the screen peripheral part and easy in deflecting yoke adjustments is manufacturable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to an exposure WA'l for a color picture tube that forms a fluorescent screen on a panel of the color picture tube.

(Prior Art) Generally, in a black matrix type color picture tube, minute dot-like or stripe-like dots that emit red, green, and blue colors are formed on the inner surface of the panel and are surrounded by a light-absorbing material III layer. A phosphor layer is formed.

Such a phosphor layer is generally formed by a precision photographic exposure method using a photosensitive material, and in the process of exposing the resist coated on the inner surface of the panel to light through a shadow mask, an exposure device for color picture tubes is used. used.

This exposure device for color picture tubes consists of a panel mounting table, an exposure light source placed below the panel mounting table, a correction lens placed between the panel A placement table and the exposure light source, and the like. It is configured to form a dot-like or stripe-like phosphor layer (blank matrix).

(Problems to be Solved by the Invention) As described above, the conventional color picture tube exposure apparatus is configured to form a black matrix of the same size over the entire surface of the panel. For this reason, in color picture tubes manufactured using conventional color picture tube exposure equipment, color shift may occur around the screen when adjusting the deflection yoke, and there is a problem in that it takes time to adjust the deflection yoke. .

The present invention has been made in response to such conventional circumstances, and provides an exposure device for a color picture tube that can manufacture a color picture tube with less occurrence of color shift at the periphery of the screen and easy adjustment of the deflection yoke. This is what I am trying to do.

[Structure of the Invention] (Means for Solving the Problems) That is, the present invention provides a panel a mounting base, an exposure light source disposed facing the panel mounting base, and an exposure light source disposed between the panel mounting base and the exposure light source. In the color picture tube exposure apparatus having a correction lens □ and a correction filter, the correction filter is a combination of a plurality of filters having different transmittances at the center and at the periphery.

(Function) First, in color picture tubes, especially color picture tubes for displays, the entire effective screen surface is almost never used, and about 90% of the center of the effective screen surface is used as the display area, and the surrounding area is The 1 oz area is often not used for display.

In the color picture tube exposure apparatus of the present invention, for example, the first correction filter has a transmittance larger in the peripheral part than the central part, and the second correction filter has a transmittance lower in the peripheral part than the central part. A correction filter that is a combination of a plurality of correction filters is arranged, and the amount of light when exposing the panel of the color picture tube can be changed depending on the part of the panel.

Therefore, the amount of light exposed to areas other than the display area at the periphery of the panel is reduced, and the size of the black matrix formed in this area is reduced, reducing the occurrence of color shift at the periphery of the screen and making it easier to adjust the deflection yoke. color picture tubes can be manufactured.

(Example) Below are drawings of the color picture tube exposure apparatus of the present invention! An example will be described with reference to the following.

FIG. 1 shows the configuration of a color picture tube exposure apparatus according to an embodiment of the present invention. A mounting table 2, an exposure light source 3 arranged below the panel mounting table 2, a correction lens 4 arranged between the panel mounting table 2 and the exposure light source 3, and a space between the correction lens 4 and the panel a mounting table 2. The correction filter 5 is a combination of a plurality of filters, such as a first correction filter 5a and a second correction filter 5b, which have different transmittances at the center and at the periphery.

Note that the distance between the first correction filter 5a and the second correction filter 5b is configured to be able to be changed arbitrarily. Furthermore, as shown by curve A in the graph of FIG. 2, where the vertical axis is the transmittance and the horizontal axis is the distance from the filter center, the transmittance of the first correction filter 5a is higher than the transmittance at the center. As shown by curve B, the transmittance of the second correction filter 5b is configured such that the transmittance of the peripheral portion is smaller than that of the central portion.

In the color picture tube exposure apparatus of this embodiment having the above configuration,
The panel 1 whose inner surface is coated with resist and the shadow mask 1a is attached is placed on the panel mounting table 2, and the light from the exposure light source 3 is passed through the correction lens 4 and the correction filter 5 to remove the transparent part of the shadow mask 1a. The resist coated on the inner surface of the panel 1 is exposed through the hole.

At this time, as shown in FIG. 3(a), the first correction filter 5a and the second correction filter 5b are brought close to each other, and as shown in FIG. 3(b), the first correction filter 5a and the second correction filter 5b are When increasing the distance between the correction filter 5a and the second correction filter 5b, by moving the positions of these filters, the first correction filter 5a and the light irradiated mainly on the periphery of the panel 1 can be changed. By changing the passing position on the second correction filter 5b, the amount of light that reaches the panel 1 can be changed depending on the part of the panel 1.

The graph in Figure 4, where the vertical axis is the composite transmittance and the horizontal axis is the distance from the center of one panel section, is as shown in Figure 3(a).
The curve C shows the change in the combined transmittance at the positions of the first correction filter 5a and the second correction filter 5b shown in FIG. 3(a). , the curved line indicates the combined transmittance at the position shown in FIG. 3(b).

As shown in this graph, in the case of the position shown in FIG. 3(b), the light from the exposure light source 3 spreads through the second correction filter 5b more than in the case of the position shown in FIG. 3(a). Therefore, the combined transmittance, that is, the amount of light that reaches the panel 1 decreases from a portion near the center.

That is, in the color picture tube exposure apparatus of this embodiment,
The amount of light during exposure can be changed depending on the part of the panel 1 without replacing the correction filter 5. For example, as shown by curve E in the graph of FIG. color picture tubes can be manufactured. In addition, in this graph,
The vertical axis indicates the black matrix size, the horizontal axis indicates the distance from the center of the screen, and the dotted line F indicates the boundary between the display area and the outside thereof. Further, the reduction width of the black matrix size at the outermost side of the screen effective surface is about 5 to 30 μm.

In the color picture tube described above, since the blank matrix size outside the display area is small, color shift occurs less in the peripheral area of the screen, and the deflection yoke can be easily adjusted.

[Effects of the Invention] As described above, in the color picture tube exposure apparatus of the present invention,
The amount of light used to expose the panel can be changed depending on the region of the panel, and a color picture tube can be manufactured with less color shift in the periphery of the screen and easy adjustment of the deflection yoke.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an exposure device for a color picture tube according to an embodiment of the present invention, FIG. 2 is a graph showing the transmittance of the correction filter, and FIG. 3 is a graph showing the transmittance of the first correction filter and the second correction filter. An explanatory diagram showing an example of position adjustment, FIG. 4 is a graph showing differences in composite transmittance at panel positions, and FIG. 5 is a graph showing differences in black matrix size at screen locations. l...Panel 2...Panel a stand 3...Exposure light source 4...Correction lens 5a. ...First correction filter 5b...
・Second correction filter applicant Higashi Co., Ltd.
Shiba Agent Patent Attorney Suyama Sa - ○-34 No. 1 M2・J (a) (b) 2;℃3 "Tsukasa Figure 4 Figure 50

Claims (3)

[Claims] (1) In a color picture tube exposure apparatus having a panel mounting base, an exposure light source disposed facing the panel mounting base, and a correction lens and a correction filter disposed between the panel mounting base and the exposure light source, A color picture tube exposure device characterized in that the correction filter is a combination of a plurality of filters having different transmittances in the center and in the periphery. (2) The correction filter includes a first correction filter whose peripheral part has a higher transmittance than the center part, and a second correction filter whose peripheral part has a lower transmittance than the central part. An exposure apparatus for a color picture tube according to claim 1, which comprises a combination of the following. (3) The color picture tube exposure apparatus according to claim 1, wherein the spacing between the plurality of correction filters is variable.