JPH05266793A - Exposure device for color picture tube panel - Google Patents

Abstract

PURPOSE:To correct the mislanding of a rotation pattern. CONSTITUTION:In an exposure device for color picture tube panel, in which a correcting lens 11 is arranged between a panel 44 for color picture tube formed with the photoresist film and an exposing light source 33 to expose the photoresist film, an optical correcting glass plate 22, which has plural sector areas discontinuously blocked by straight lines radially extended from the center, is installed to the upper part of the light source 33. The light source 33 and the optical correcting glass plate 22 are rotated to eliminate the influence of the discontinuous surface to the panel 44 and eliminate the mislanding of the rotation pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube panel exposure apparatus.

[0002]

2. Description of the Related Art Conventionally, in forming a phosphor screen of a picture tube, a panel 44 coated with photoresist is exposed through a shadow mask 45 as shown in FIG. Is forming.

The lens system in the exposure apparatus of this color picture tube panel is constructed so that the trajectory of the light beam from the light source 33 approximates the trajectory of the electron beam formed by the deflection yoke deflecting the electrons. If the approximation falls within the allowable range of the positional deviation between the electron beam landing point and the landing point during exposure, a color picture tube with good color reproduction can be obtained.

In recent years, the demand for higher definition of color picture tubes has increased, and the pitch of the fluorescent screen of the color picture tubes has become finer. As the pitch of the phosphor screen becomes finer, the allowable range of electron beam landing becomes smaller, and more precise approximation of the ray trajectory becomes necessary. One of the so-called mislanding patterns, which is a misalignment of the landing position caused by the difference between the electron beam and ray trajectories, has a rotation direction component error as shown in FIG. The arrow indicates the direction of mislanding, and the opposite direction is naturally possible. A correction lens 11 having an inclination in the circumferential direction may be used to correct a mislanding having a rotational direction component, but the curved surface shape always has a discontinuous surface, and the conventional correction lens 11 is fixed during exposure. In the exposure apparatus for the color picture tube panel as it was, there was a problem that the discontinuous surface appeared as unevenness on the screen as it was.

[0005]

As described above,
Conventionally, in a lens system that corrects mislanding having a rotational direction component, a correction lens surface having a discontinuous surface causes film unevenness at a position corresponding to that portion on the screen. As a means for solving this, it is conceivable to rotate the correction lens, but it requires a large amount of cost to equip the exposure apparatus with a mechanism for rotating the correction lens having a large aperture. Furthermore, since it is located relatively close to the screen, it greatly affects the film. Further, the correction lens has a large diameter, which requires processing cost and processing time.

An object of the present invention is to provide an exposure apparatus for a color picture tube panel which can reduce the processing cost and the processing period and can easily correct the mislanding having the rotational direction component.

[0007]

SUMMARY OF THE INVENTION The present invention provides an envelope for mounting a color picture tube panel having a photoresist film formed on its inner surface, an exposure light source provided at the bottom of the envelope, and the exposure. Of a color picture tube having a plurality of correction light sources arranged in the middle of the panel and a light source emitted from the light source for exposure through the correction lens and irradiating the photoresist film with light. In the exposure apparatus, a light source correction glass plate is provided on the radiation surface of the light beam of the exposure light source, and the light source correction glass plate has a plurality of fan-shaped regions having discontinuous surfaces separated by straight lines extending radially from the central portion. Then
The thickness from the bottom surface of the light source correction glass plate at an arbitrary point on each surface of the fan-shaped region is Z, and the angle formed by one discontinuous surface that divides the fan-shaped region and a straight line connecting the arbitrary point and the center is θ. , F is the radial distance from the center, and f
When (r) is the number of continuous Hakodate and the thickness of the center is T, the following relationship is satisfied: Z = f (r) · θ + T, and the exposure light source is rotated to expose the photoresist.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view showing the outline of the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing a discontinuous surface of the optical correction glass plate of FIG. 1, and FIGS. 3 (a) and 3 (b) are 2A and 2B are a plan view and a side view showing the configuration of the optical correction glass plate of FIG. 1.

As shown in FIG. 1, an exposure light source 33 is arranged at the bottom of the envelope 2 having the opening 1, and the envelope 2 is further opened from the light source 33 side to the opening 1 side. The optical correction glass plate 22 for correcting the rotation pattern and the correction lens 11 are sequentially arranged at predetermined intervals toward each other.

In exposing the color picture tube panel 44, the panel 44 having a photoresist film formed thereon so as to cover the opening 1 of the envelope 2 is placed and the photoresist film is exposed. At this time, as shown in FIG. 2, the optical correction glass plate 22 is divided into a plurality of fan-shaped fan-shaped regions 55, which are discontinuously divided from each other on the glass surface by a straight line extending radially from the central portion, and is inclined in the circumferential direction. The discontinuous surface 6 is provided for each fan-shaped region 55.
6 is formed and is rotated together with the light source 33 at the time of exposure.

This optical correction glass plate 22 is shown in FIG.
It is configured as shown in (a) and (b). Each fan-shaped area 55
Has an inclination for correcting the rotational direction component error,
The fan-shaped regions 55 are separated from each other by a discontinuous surface 66. The curved surface of the optical correction glass plate 22 is represented by Z = f (r) · θ + T for each fan-shaped region 55.

Here, Z is the height of the surface of the optical correction glass plate, T is the thickness of its center, r is the radial distance from the center, and f (r) is a function in the radial direction.

Such an optical correction glass plate 22 is used by rotating it with respect to the panel 44 in order to eliminate the influence of the discontinuous surface 66. Even if rotated, the central portion of the optical correction glass plate 22 where the influence of the discontinuous surface 66 is likely to appear is f (r)
By setting f (r) → 0 when r → 0, the discontinuous surface 66
I was able to reduce the effect of.

When f (r) is a constant, the optical correction glass plate 22 is realized by processing with a simple die, is inexpensive, and has a great effect.

Further, if the discontinuous surface is divided into a large number, the step difference between the adjacent fan-shaped regions 55 becomes small, and therefore the discontinuous surface 66.
It is possible to perform high-quality exposure with less scattering of the exposure light rays, but it is difficult to process the optical correction glass plate 22 and the cost increases as the number of divisions increases. It is appropriate that the number of divisions in which high-quality exposure is performed by combining the rotation of the light source is 8 divisions.

[0017]

As described above, according to the present invention, by rotating the optical correction glass plate for correcting the rotational direction component error, the rotational direction component which is difficult to be solved by the conventional exposure apparatus for the color picture tube panel is used. Mis-landing can be easily corrected, and the effect of the discontinuous surface can be reduced because it is closer to the light source than the correction lens, and the rotation of the correction lens can be done by mounting it on the light source of the conventional rotary exposure device. There is no need to newly add a mechanism, and since the diameter is smaller than that of the correction lens, there is an effect that the cost and period required for producing the optical correction glass plate can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing the outline of the configuration of an embodiment of the present invention.

FIG. 2 is a perspective view showing a discontinuous surface of the optical correction glass plate of FIG.

3A and 3B are a plan view and a side view showing the configuration of the optical correction glass plate of FIG.

FIG. 4 is a cross-sectional view illustrating the outline of the configuration of an example of a conventional exposure apparatus for a color picture tube panel.

FIG. 5 is a plan view showing an example of a rotational direction component of mislanding.

[Explanation of symbols]

 1 Aperture 2 Envelope 11 Correction Lens 22 Optical Correction Glass Plate 33 Light Source 44 Panel 45 Shadow Mask 55 Fan-shaped Area 66 Discontinuous Surface

Claims (3)

[Claims] 1. An envelope for mounting a color picture tube panel having a photoresist film formed on its inner surface, an exposure light source provided at the bottom of the envelope, and an intermediate between the exposure light source and the panel. And a plurality of correction lenses arranged in the exposure light source for irradiating the photoresist film with the light emitted from the light source for exposure through the correction lenses to expose the photoresist film. A light source correction glass plate is provided on the emission surface of the light beam of the light source, and the light source correction glass plate has a plurality of fan-shaped regions having discontinuous surfaces separated by straight lines extending radially from the center, and each of the fan-shaped regions. Z is the thickness from the bottom surface of the light source correction glass plate at any point on the surface of, and the angle between the one discontinuous surface dividing the fan-shaped region and a straight line connecting the center with the angle θ is from the central portion. Radial distance When f is the number of continuous Hakodates and r is the thickness of the center, and T is the number of continuous Hakodates, the relationship of Z = f (r) · θ + T is established, and the exposure light source is rotated to expose the photoresist. An exposure device for a color picture tube panel. 2. The exposure apparatus for a color picture tube panel according to claim 1, wherein the f (r) is a constant. 3. An exposure apparatus for a color picture tube panel according to claim 1, wherein said optical correction glass plate is composed of eight divided fan-shaped regions.