KR950001340Y1 - Crt forming apparatus - Google Patents

Abstract

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Description

Exposure apparatus for manufacturing fluorescent surface of color cathode ray tube

Fig. 1 (a) is a plan view of a color cathode ray tube and a partially broken side view thereof, (b) is an enlarged detail view of part A in (a), and (c) is a cross-sectional view taken along line A-A in (b).

2 is a reference diagram showing a light source unit in a conventional exposure apparatus for manufacturing a fluorescent surface of a color cathode ray tube.

3 is a reference diagram showing the operation of the exposure apparatus for manufacturing a fluorescent screen in FIG.

4 is a reference diagram illustrating a shift between a black matrix (BM) pixel and a phosphor pixel in a conventional exposure apparatus.

FIG. 5 is a reference diagram showing the state of FIG. 4 numerically in a 14 에서 -90 ° color cathode ray tube.

6 is a reference diagram showing a light source unit in the present article.

7 is a reference diagram showing the operation of FIG.

8 is a reference diagram specifically showing the action of the main portion in FIG.

* Explanation of symbols for main parts of the drawings

8: concave lens

The present invention relates to an exposure apparatus for manufacturing a fluorescent surface of a color cathode ray tube, and in particular, an optical correction can be performed by using a concave lens on the light source of the exposure apparatus for producing a phosphor pixel, in order to shift the overlapping position between the BM pixel and the phosphor pixel. The exposure apparatus which exists.

The fluorescent screen pixel of the color cathode ray tube consists of the BM pixel 2 of the unnecessary external light absorbing material and the red (R), green (G), and blue (B) three primary colors (3) of the unnecessary external light absorbing material as shown in FIG. It is.

In the method of manufacturing the fluorescent pixel, a photographing method using a shadow mask 4 having several hundred thousand openings having a predetermined interval as a subject is used. Here, a BM pixel 2 is formed on the inner surface of the windshield 1. The three primary phosphor pixels are superimposed on the top in order of G, B, and R, respectively.

At this time, when forming the BM pixel, the negative and phosphor pixels 3 are formed using the positive photosensitive method.

When the BM pixel 2 is formed, the photosensitive film thickness is about 1-2 mu, while the photosensitive film 10 at the time of forming the phosphor pixel 3 is a mixed photosensitive film having a thickness of about 25-30 mu m. In FIG. 10, the organic material coating film 9 is additionally used in order to improve the adhesion on the windshield 1 as shown in FIG. 3, and in fact, it is about 30-% more than the BM pixel when the phosphor pixel 3 is exposed. It will have a thickness difference of 35μ.

On the other hand, in FIG. 3, the difference of the overlapping center position of the BM pixel 2 and the fluorescent substance pixel 3 was exhibited by these thickness differences.

In this case, the exposure light beam a emitted from the light source 5 as shown in FIG. 2 at the time of exposure of the BM pixel 2 passes through the opening 4a of the shadow mask 4 and the BM pixel 2 on the inner surface of the windshield 1. Is formed, the center position of the BM pixel 2 becomes the "D" position.

In addition, when exposure is performed at the same light source 5 position even when the phosphor pixel 3 is formed, when the above-described thickness difference is t ₀ , the center position of the phosphor pixel 3 becomes "E" so that The amount of shift in the center position of the two pixels is generated.

Therefore, in order to reduce such a misalignment phenomenon, in the case of exposing the phosphor pixel 3, the phosphor pixel of which two pixel centers coincide by using the exposure light beam b, which is a position of a new light source 5a whose light source position is upwardly adjusted by a constant? L, is exposed. Position "F".

However, in the prior art, Δℓ is not a constant amount due to the color cathode ray tube structure, and has a function of increasing according to the pixel formation position r (or deflection angle) at the center of the fluorescent surface. A satisfactory result could not be obtained, resulting in a deterioration of the screen, such as the fluorescent material unattached portion 11b in the other color BM pixel as shown in FIG.

The relationship between the amount of Δℓ and the amount of misalignment α according to the pixel formation position r is shown in FIG.

The present invention has been devised to solve such problems in the related art, and it is particularly desirable to provide an exposure apparatus having an optical correction mechanism for matching the center of overlap of BM pixels and phosphor pixels between a light source side light source and a shadow mask of a conventional exposure apparatus. It is characterized by.

This will be described in more detail below.

That is, FIG. 6 shows a light source part of the exposure apparatus according to the embodiment of the present invention.

Here, the light source 5 is installed in a case in which the coolant inlet and outlet 6 are formed, and the upper surface of the flat glass is provided with a flat glass 7 for shielding the coolant from overheating of the light source. The concave lens 8 is configured to be replaced.

Further, the curved surface of the concave lens 8 can be selectively designed according to the amount of? L of a predetermined color cathode ray tube, which is essentially the same as the technique of manufacturing a correction lens in the exposure apparatus.

As the material of the concave lens 8, ordinary optical glass may be used, but quartz glass may be used as the transmittance, heat ray absorptivity, strength and rupture resistance, and workability to ultraviolet rays of about 3650 ° A. It is preferable to.

This proposal of this configuration has the following effects and effects.

That is, FIG. 7 shows the operational state of the present invention at arbitrary positions r ₁ and r ₂ , and FIG. 8 is a detailed view of the main part of FIG. 7.

In this case any location r _1, enters the r ₂ and beams (b _1, b _2), the point of intersection between the extended line and the color cathode ray tube axis 5a, 5b referred to home, and the position and distance between the actual light source (5) of the intersection of When Δℓ ₁ and Δℓ ₂ , if these Δℓ ₁ and Δℓ ₂ are equal to the amount of Δℓ at the points r ₁ and r ₂ that are accounted for in FIG. 5, the BM pixel 2 and the phosphor pixel ( There is no deviation in 3).

Therefore, this paper in the concave lens 8, the upper concave surface side surfaces slope to the actual light source 5, a light beam as the eighth help of C _1, the rays of light incident to the C ₂ point shift amount 0 from the b _1, By designing so that it can be refracted by b ₂ , the deviation can be eliminated.

Such a proposal can essentially eliminate the amount of deviation between BM and phosphor pixels in an exposure apparatus for producing a fluorescent surface of a color cathode ray tube, so that color purity, luminance and white uniformity can be ensured with high quality. Also in the design and manufacturing margin is increased and there is a beneficial feature to ensure a good yield accordingly.

Claims (2)

1. An exposure apparatus for manufacturing a fluorescent surface of a color cathode ray tube having a light source 5, a case having a coolant inlet and an outlet 6, and a light source portion comprising a light source shielding means for preventing overheating of the light source. An exposure apparatus for producing a fluorescent surface of a color cathode ray tube, characterized in that the means is formed as a concave lens (8) whose upper surface is a concave surface. The exposure apparatus for producing a fluorescent surface of a color cathode ray tube according to claim 1, wherein the concave lens (8) is an optical glass material or a quartz glass material.