JPH0287443A - Exposing device for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain a fluorescent surface with fluorescent substance coated evenly over the panel surface by reciprocating a light source, in which the apparent exposure source center in the horizontal direction differs from the apparent exposure source center in the vertical direction, in the lamp tube axial direction during exposure. CONSTITUTION:Exposure device for a color image-receiving tube has a light source 5, wherein a lamp mask 2 is installed over a lamp 1 with a certain gap reserved. This lamp mask 2 is provided with a slit 3 and retained by a lamp mask retainer 4. The light source 5 is reciprocated in the lamp tube axial direction by a moving cam 12 during exposure. Straight tube type exposure source with ots apparent exposure source center in the horizontal direction being different from the apparent exposure source center in the vertical direction is reciprocated in the lamp tube axial direction during exposure. This provides good landing characteristic and color pureness margin and also reduces unevenness of the light quantity due to dust and/or contamination on the panel surface to which fluorescent substance is baked fast, which should accomplish a uniform fluorescent surface with good performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure device for color picture tubes, and in particular, to an exposure device for color picture tubes. The present invention relates to an exposure device for exposure.

[Conventional technology]

Exposure of a dot type color picture tube is performed by an exposure apparatus as shown in FIG. That is, the light source section 5,
A light amount adjustment filter 6 that controls the amount of light emitted from the light source section 5, a correction lens 7 that makes the previous light ray approximate the trajectory of the electron beam, and an exposure table 8 on which the panel 13 is mounted.
This is carried out using an exposure device consisting of:

FIG. 3 shows a schematic structure of a light source section 5 of a conventional exposure apparatus disclosed in, for example, Japanese Patent Laid-Open No. 57-176639, in which (A) is a front view thereof, and (B) is a side cross-sectional view. It is. The front view in (A) is a view seen from the panel 13 side to be exposed, and the light source section 5 is provided with a circular window 9, and the lamp l,
The structure is such that only a part of the straight lamp l appears to be shining due to the lift mask 2. In addition, H in the figure is the horizontal axis,
■ is the vertical axis.

Next, the operation will be explained.

As shown in FIG. 3(B), the lamp 1 is used with water cooling, and the panel 13 is exposed to light through a circular window 9. In the conventional technology, the horizontal/vertical deflection center difference (hereinafter referred to as H) of the deflection yoke
This is an exposure method for a color picture tube panel in which the difference (referred to as /V difference) is corrected with a favorable tendency in the diagonal direction. Specifically, the H/V difference that tends to occur due to the characteristics of the deflection yoke in dot-in-line tubes is corrected in a favorable manner. That is, when printing the fluorescent screen on the panel 13, the lamp 1 is arranged as shown in FIG. 3(A) with respect to the H/v axis of the fluorescent screen. That is, the longitudinal direction of the straight tube ultra-high pressure mercury lamp is made to coincide with the H direction.

Moreover, it is important to always keep it facing this way during exposure.

FIG. 4 shows the operation of the prior art, in which (A) shows a cross section in the H direction of FIG. 3, and (B) shows a cross section in the ■ direction.

As shown in FIG. 4(B), when printing in the {circle around (2)} direction, for example, at a deflection angle ω, the imaginary light source is exposed as if coming out from the center O of the arc.

On the other hand, as shown in FIG. 4(A), at a location where the deflection angle in the H direction is ω, it does not appear that light is emitted from the center O of the arc of the lamp 1 because of the presence of the lamp mask 2. In other words, the light is exposed as if it were emitted from a location Δ apart from the center 0, indicated by the x mark. In other words, an exposure device for a color picture tube is constructed by arranging a lamp mask at a distance from the light source and providing anisotropy in the position of the light source depending on the relationship between the light source and the lamp mask. (2) The difference was corrected with a favorable tendency in the diagonal direction, resulting in good landing characteristics.

[Problem to be solved by the invention]

As described above, the conventional color picture tube exposure apparatus is set so that the lamp 1 always faces in a fixed direction during exposure. Therefore, in this case, there is a problem in that dirt on the circular window 6 of the lamp 1 or the light source section 5 appears unevenly on the panel surface during phosphor exposure.

This invention was made in order to solve the above-mentioned problems, and the printing of the phosphor on the panel surface eliminates unevenness and improves the color image reception that can obtain a uniform and good phosphor surface. The purpose of the present invention is to provide a tube exposure device.

[Means to solve the problem]

In the color picture tube exposure device according to the present invention, the apparent center of the upper exposure source in the horizontal direction is different from the center of the upper exposure source in the vertical direction, and the straight tube has its longitudinal direction in the horizontal direction. The exposure source is made to reciprocate in its longitudinal direction, that is, in the horizontal direction.

[Effect]

In the exposure apparatus according to the present invention, since the light source section is reciprocated in the direction of the lamp tube axis, even if there is dirt or dust attached to the lamp or the circular window of the light source section, the light source section will not move on the panel surface where the phosphor is printed. Unevenness in the amount of light due to dirt and dust is reduced, and a uniform and good fluorescent surface is formed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a light source section of a color picture tube exposure device according to an embodiment of the present invention, (A) is a side view, and (B)
is a front view seen from panel 8.

A lamp mask 2 is arranged above the lamp 1 with a space therebetween. A slit 3 is provided in the lamp mask 2. The lamp mask 2 is held by a lamp mask holding section 4. The light source section 5 is configured to be reciprocated in the direction of the axis of the lamp tube during exposure. This reciprocating movement is performed by the light source section moving cam 12.

In this embodiment, the apparent center of the upper exposure source in the horizontal direction is different from the apparent center of the upper exposure source in the vertical direction, and the straight tube exposure source is moved back and forth in the lamp tube axis direction during exposure. Since the movement is made to move, it is possible to obtain good landing characteristics and a margin for color purity, and it is also possible to reduce unevenness in the amount of light due to dirt and dust on the panel surface where the phosphor is printed, so that it is uniform. This has the effect of forming a good fluorescent surface.

〔Effect of the invention〕

As described above, according to the present invention, the appearance in the horizontal direction is the center of the upper exposure source, and the appearance in the vertical direction is the center of the upper exposure source. By moving it, it is possible to obtain a fluorescent surface in which the phosphor is evenly and uniformly applied on the panel surface, and it is possible to improve the condition of the fluorescent surface of the dot-in-line type of high-resolution color picture tube. effective.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a light source section of a color picture tube exposure apparatus according to an embodiment of the present invention, and (A) is a cross-sectional side view thereof;
B) is a front view thereof, FIG. 2 is a diagram showing an exposure device for a color picture tube, FIG. 3 is a diagram showing a light source section of a conventional exposure device for a color picture tube, and (A) is a front view thereof. ) is its cross-sectional view, and Figures 4 (A) and (B) are Figure 3 (A), respectively.
FIG. 6 is a diagram showing the effect in the H-direction cross section and the ■-direction cross section of the light source section of FIG. In the figure, 1 is a lamp, 2 is a lamp mask, 3 is a mask slit, 4 is a lamp mask holding part, 5 is a light source part, 6
is a circular window, 7 is water for cooling, 8 is an exposure table, 9 is a circular window, 10 is a part of the right angle mark, 11 is water for water cooling, 12
is a cam for moving the light source. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) An exposure device for color picture tubes used for manufacturing the fluorescent surface of a color picture tube, which is equipped with a straight tube exposure source, and has an apparent center of the exposure source in the horizontal direction and an apparent center of the exposure source in the vertical direction with respect to the fluorescent surface. 1. An exposure apparatus for a color picture tube, comprising: an exposure means for exposing the light source such that the center thereof is different from the center of the exposure source; and an exposure source moving means for moving the exposure means in the longitudinal direction of the straight tube exposure source.