KR860000090B1 - Filter glass for cathode ray tube - Google Patents

Abstract

Filter glass, having the same radius of curvature as that of a cathode ray tube panel, consists of two layers of glass with a thickness of 0.35-0.40 mm each and a layer of polymer adhesive between the layers of glass with a thickness of 0.35-0.40 mm. The polymer adhesive is based on polyvinylbutyral epoxy resin and mixed with a UV ray absorbing agent such as hydroxyphenyl -bensotriazole. The outer surface of the filter glass is treated for the purpose of non-glare. The filter glass is attached to the front panel of the CRT, with a slight gap between them. This filter glass does not distort the image on the CRT, absorbs 99% or more of the UV rays and reduces eyestrain.

Description

Filter glass of cathode ray tube

1 is an illustration of a conventional filter.

2 is a cross-sectional view of the filter glass of the present invention.

3 is an enlarged cross-sectional view of a matte finish of the surface of the filter glass of the present invention.

4 is an exemplary view showing a state in which the filter glass of the present invention is curved to match the curved surface of the cathode ray tube.

5 is a cross-sectional view showing an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: primary glass 2: secondary glass

3: adhesive layer 31: ultraviolet absorber layer

32: adhesive layer

The present invention relates to a filter glass in a filter glass for filtering ultraviolet rays harmful to a human body emitted from a cathode ray that is injected into various cathode ray tubes (CRT: CRT) including a television receiver, a TV entertainment machine, and an office equipment monitor such as a computer. It forms a curved surface to match the curved surface of the cathode ray in the plane of, so that the filter grass is curved with the same curvature with a certain gap with the surface of the cathode ray tube, so as to prevent visual disturbance of the image, it effectively filters ultraviolet rays by the absorber of ultraviolet ray. The present invention relates to a filtergrass of a cathode ray tube, characterized by being able to protect eyesight.

The filter glass of the conventional cathode ray tube is made of one thin plate, but the thin plate is made of two transparent flat glass glasses 10, and is formed of a semi-transparent heat reflective metal oxide layer therebetween. Since the filter glass is a flat plate as illustrated in FIG. 1, when the flat glass 10 is fixed to the front of the cathode ray tube screen 11, the image on the curved screen is viewed through the filter glass of the flat plate. Not only is it difficult to see the correct image such as the image is distorted, but also objects in the room are reflected on the surface and cause visual disturbance.In addition, a semi-transparent heat reflection metal oxide layer is formed inside the filter glass, which removes some degree of glare. There was a problem in that it is not completely removed and the damage of ultraviolet rays harmful to vision during long time viewing.

The present invention, in order to correct the defects of the prior art by applying an adhesive containing a UV absorber to the inside of two rectangular glass curved to match the screen of the cathode ray tube to bond the glass to completely absorb the ultraviolet rays emitted from the cathode ray The surface of the simultaneous filter glass that absorbs and removes the surface of the cathode ray tube coincides with the surface of the simultaneous filter glass so that the image of the cathode ray tube can be seen without distortion. It is about the development of a new filtergrass that can be used safely and safely.

The present invention will be described in detail with reference to the accompanying drawings.

Two rectangular plates curved on the same surface as the curved surface of the cathode ray tube so that the correct image can be seen while absorbing and removing ultraviolet rays emitted from various cathode ray tube screens such as TV receivers, TV entertainment rooms, and office equipment monitors such as computers. Of the filter grass (1) (2) is bonded to each other by the adhesive layer (3) to form a filter glass. The adhesive layer 3 contains ultraviolet adsorbent and is 2-3 mm each of the thicknesses of the primary and secondary glass before and after, and is a tempered special glass extruded under high temperature and high pressure. When the laminated glass is mounted in front of the screen of the cathode ray tube as shown in Fig. 4, both the inner surface 1S of the primary glass 1 and the outer surface 2S of the secondary glass 2 are equally curved to form the screen of the cathode ray tube. It can be made to hold | maintain at constant distance G from a surface. The outer surface (2S) of the secondary glass (2) is formed matte to prevent surface reflection, and when treated with matte, the surface of the glass is immersed in a hydrofluoric acid solution as shown in FIG. It is immersed and corroded or polished with send paper to form irregular or irregular irregular surface of about 3 ~ 6㎛, and also to precipitate crystals of silicon oxide on the glass surface to become irregular surface.

The adhesive layer (3) bonded to the primary glass (1) and the secondary glass (2) is a mixture of a synthetic resin adhesive and an ultraviolet absorber, and the adhesive uses one or two blends of polyvinyl butyral or epoxy resins. For example, a two part epoxy resin such as Shell Chemical's "Epikote 828" is preferable.

Ultraviolet wavelength is less than 4000 Å, so the UV absorbents that are worth using are in the range of 3000 ~ 4000 ,, and especially should be able to absorb weak light with the wavelength of 3530 잘. Suitable ultraviolet absorbers include 2 (2'-hydroxy-3 ', 5'di-tert-butylphenyl) benzotriazole (hydroxyphenyl benzotriazole), 2, 2'-dihydroxy-4-meth Methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, ethyl-2-cyano-3-phenylcinnamate, and the like, and more preferably, the properties of hydroxyphenylbenzotriazole and hydroxy-benzophenone Phosphorus Phenylsalicylate.

The mixture consists of 98.0 to 99.5 parts of adhesive and 0.5 to 2.0 parts of UV absorbing material by weight. If a colored adhesive is required, the pigment may be included therein in a weight ratio of 0.5 to 1.5 parts.

The pigment may be selected from the Microlity-T pigments of Ciba-Geigy.

A mixture of these adhesive and ultraviolet absorbers is used for bonding the primary glass 1 and the secondary glass 2, and the thickness of the adhesive layer 3 is preferably 0.35 to 0.40 mm, but more preferably 0.38 mm. Filtergrass is light brown or light gray because it is colored by adding pigment to the adhesive. When the glass of filter glass is colored glass, the adhesive is a transparent adhesive. On the contrary, when the glass is formed of transparent glass, a colored adhesive is used. And when transparent filter glass is required, a transparent adhesive is used for transparent glass.

In addition, as shown in FIG. 5, the ultraviolet absorber may be laminated and bonded separately. At this time, in order to thin the primary glass (1) and the secondary glass (2) first spraying the coating 31 with a solvent and ultraviolet absorbing material on the inner surface of the secondary glass (2) with an ultraviolet absorbing material of 2000 ~ 3000Å As a result, lamination is performed, and an inner surface of the primary glass 1 is laminated with an adhesive layer 32, and then the two glasses are bonded to form a filter glass.

UV absorbers are selected from the above-mentioned materials, and solvents include toluene, benzene, acetone, ethanol, and the like. The solution may penetrate into the mixture.

The filter glass is thus matted to prevent surface reflection, which is also matted on the outer surface (2S) of the secondary glass or, in some cases, on the inner surface (1S) of the primary glass to further ensure the non-reflective. Matte treatment is to form irregular irregular surface by immersing glass surface in hydrogen fluoride liquid or grinding with send paper.

As described above, the present invention is formed by bending the primary glass and the secondary glass into the curved surface of the screen of the cathode ray tube, cutting them into rectangles, and attaching the two glass surfaces thinly with a colored adhesive containing a UV absorber, so that the front surface of the cathode ray tube is mounted in front of the screen. If the image is not deformed by the curved filter glass, and completely absorbs ultraviolet rays or flashes, the screen can be used safely even without long-term visual disturbance.

Example 1

Same as the screen of cathode ray tube, 2 transparent glass plates curved in the same way as the screen of cathode ray tube were matted and 96.6% of Epicoat 828 adhesive, which is a shell chemical company product, 1.9% of hydroxyphenylbenfotriazole as UV absorber, And the filter glass of the present invention by bonding two curved glass by applying a thickness of 0.38mm with a mixture of an adhesive and a UV absorber blended in a weight ratio of 1.5% by weight of micro yellow pigment and micro red pigment of Ciba-Geigi as a pigment. Get

The result of the absorption test of ultraviolet rays by mounting the filtergrass of the present invention on the receiver is as follows.

UV (wavelength 360mm-380mm): 0.6% of the value without filter, reflectance: 7.8%.

Example 2

The surface of the filtergrass of Example 1 was matted to completely remove the reflectance.

Example 3

The primary glass and the secondary glass are colored glass, and the transparent glass adhesive is mixed with 98% of the adhesive of Epichem 828, manufactured by Cell Chemicals Co., Ltd., and hydroxyphenylbenzotriazole (2%) as the ultraviolet adsorbent. Get filter grass. The glass sheet was not matted.

The test results are as follows.

UV: 0.7% when used as filter, reflectance: 6.6%.

Example 4

The glass surface of the filtergrass of Example 3 was matted to completely remove the reflectance.

Claims (8)

Same as the screen of cathode ray tube, rectangular primary glass and secondary glass are combined by weight ratio of 98 ~ 99.5% synthetic resin adhesive and 0.5 ~ 2.0% UV absorber in a weight ratio to form a thin sheet, Filter glass of cathode ray tube, which is installed at intervals to absorb correct images and ultraviolet rays. The method of claim 1, wherein the synthetic adhesive is selected from the group of adhesive materials, such as polyvinyl butyral adhesive 1 part time epoxy and adhesive 2 part type epoxy resin, and 2 (2'-) as an ultraviolet absorber. hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2', 2'-dihydroxy-4-methoxybenzolphenone, 2-hydroxy-4-methoxybenzophenone and ethyl-2-cyano-3-phenylcinnamate And filter glass of a cathode ray tube, characterized in that it is selected from among phenylsalide cyclites. Claim 1 filtergrass is 0.35 ~ 0.40mm in thickness of the composition, the primary and secondary glass tubes are each 2.0-3.0mm in thickness. The thickness of the synthetic adhesive of claim 1 "filtergrass" is 0.35 ~ 0.40mm, the thickness of the ultraviolet absorber is 2,000 ~ 3,000Å. The primary and secondary glass plates of claim 1 "filtergrass" are colored and the adhesive composition is transparent. The primary and secondary glass plates of claim 1 "filtergrass" are transparent and the adhesive composition is colored. The primary and secondary glass plates of claim 1 "filtergrass" are brown or gray. The "filtergrass" of claim 1, wherein the outer surface of the secondary glass plate 2 away from the CRT screen is completely matted.

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