JPS6338979A - Crt filter - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a CRT filter.

(Prior art) Word processors, personal computers, etc.
CRT display devices such as A-devices and analytical devices have become so widespread that they have become indispensable in offices, homes, and factories. Along with this, the number of operators who come into close contact with CRTs for long periods of time is increasing, and in developed countries, occupational diseases of operators are beginning to be taken up as a social problem. A common symptom of this occupational disease is optic nerve fatigue, and although the scientific cause and effect relationship has not been fully elucidated, consideration must be given to the risk of adverse effects from exposure to electromagnetic waves, static electricity, ultraviolet rays, etc.

In order to prevent such adverse effects, a CRT filter is usually attached to cover the CRT portion of the CRT display device.

Also, U.S. Patent No. 425373 and U.S. Pat. No. 59-106
No. 176 proposes a removable screen filter that can be brought into close contact with the CRT surface.

(Problems to be Solved by the Invention) Since commonly used CRTs have a curved surface, when a flat CRT filter is attached, the display often appears blurred, especially in a part of the corner of the screen. The reality is that operators are inconvenienced by having to remove the CRT filter when working.

Furthermore, conventionally proposed CRT filters require a special frame to be attached so that they can be removed.
CRT filters are also becoming increasingly expensive.

Furthermore, when handling a CRT filter that is structured to be in close contact with the CR7 surface, extreme care must be taken to avoid damaging the filter surface during the manufacturing process.

The present inventor has completed the present invention as a result of studies to solve such problems.

(Means for Solving the Problems) That is, the CRT filter according to the present invention has a shape that can accommodate the CRT tip portion and come into close contact with the CRT surface, and the CRT filter has a removable protective film. It is a CRT filter that is protected on one or both sides. In this case, the ta CRT filter does not produce interference fringes with the CRT scanning line, or even if interference fringes do occur, the interference fringes have openings that do not substantially cause afterimages, and are combined with a net whose surface is coated with metal. A laminated sheet made of a resin sheet or film is preferable.

FIG. 1 shows an example of a CRT filter according to the present invention, and the CRT filter according to the present invention is used in a Li-like manner, for example, as shown in FIG. It is something.

The CRT filter according to the present invention is made of, for example, polyvinyl chloride resin, high nitrile resin, polyether ether ketone resin, polyether sulfone resin, polycarbonate, diethylene glycol bisallyl carbonate,
High nitrile resins such as polyethylene terephthalate, polymethyl methacrylate, acrylonitrile-styrene copolymer, etc. are particularly preferred in terms of adhesion and moldability, and do not cause interference fringes between sheets or films made of these synthetic resins and CRT scanning lines. It is preferable to use a net having openings that do not substantially cause interference fringes even if they occur, and whose surface is coated with metal.

The net has a mesh structure made of synthetic resin or metal fibers, and the opening of the net and the size of the filaments are appropriately selected depending on the performance of the cathode ray tube, the size, the type of figure on the cathode ray tube, and the purpose. This net surface is further coated with metal.

Copper, iron, nickel, etc. or alloys such as stainless steel can be used as the metal, and the coating is performed by coating, vapor deposition, sputtering, ion blating, VD, etc. A laminated sheet is obtained by a conventional method using a metal-coated net and a sheet or film made of a synthetic resin.

In the present invention, a removable protective film is then temporarily attached to one or both sides of this laminated sheet, which is called a masking film, which can be easily peeled off from the adherend and has a certain degree of firmness. Even though it is temporarily attached, it is required that there is no contamination caused by the masking film when it is peeled off, so the base material is polyvinyl chloride or polyethylene film, and the adhesive used in general adhesive tape is applied to this film. It is applied and then used. The adhesive is appropriately selected depending on the material of the CRT filter.

Using this laminated sheet, the CRT filter according to the present invention can be obtained by vacuum forming, pressure forming, etc.

Optionally, ultraviolet absorbers, antistatic agents, dyes, pigments, etc. may be added to the sheet or film obtained from the synthetic resin.

(Example) Details will be shown below with reference to Examples.

Example 1 A laminated sheet having a thickness of 11 was obtained using a conventional method using a polyvinyl chloride sheet and a polyethylene terephthalate net (TYLER standard sieve 70 mesh) on which metal copper was vapor-deposited. A polyvinyl chloride film coated with an acrylic adhesive (Structopon, manufactured by Mitsui Toatsu Kagaku n) was temporarily attached to one side of the laminated sheet. Using this laminated sheet, a CRT filter as shown in FIG. 1(A) was obtained by air pressure molding using an aluminum mold.

Example 2 A high nitrile resin sheet (manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name "Valex") was used instead of a polyvinyl chloride sheet, and polyethylene terephthalate neft (TYLER standard sieve 70 mesh) on which metallic copper was vapor-deposited was prepared using a conventional method. A laminated sheet with a thickness of 1 inch was obtained.

A polyvinyl chloride film coated with an acrylic adhesive (Structopond, manufactured by Mitsui Toatsu Chemical Co., Ltd.) was temporarily attached to one side of the laminated sheet.

In the same manner as in Example 1, a CRT filter as shown in FIG. 1 (b) was obtained.

(Effects of the Invention) fl, l The part of the CRT filter that comes into close contact with the CRT is not damaged during the molding process, and the CRT filter has a part that is configured in a shape that allows it to come into close contact with the CRT, so the design is improved. Furthermore, it is possible to prevent the phenomenon of display smearing in the corners of the screen.

+21 Since there is no need to remove the CRT filter, the operator can be freed from the risk of adverse effects caused by exposure to tMi waves, etc. (3) The molding process is easy, so it can be finished at a low cost.

(4) Since so-called MOIRE interference fringes do not occur on the CRT screen, operators can work without eye fatigue or resulting mental pain.

[Brief explanation of the drawing]

FIG. 1 shows an example of a CRT filter according to the present invention, the surface of each of which is temporarily attached with a protective film. FIG. 2 shows an example of the use of the CRT filter according to the present invention, where 1 indicates the CRT filter and 2 indicates the CRT.

Claims (2)

[Claims] (1) In a CRT filter having a shape capable of accommodating the CRT tip portion and coming into close contact with the CRT surface, the CRT filter
A CRT filter whose one or both sides are protected by a removable protective film. (2) The CRT filter does not produce interference fringes with the CRT scanning line, or even if interference fringes do occur, the interference fringes have openings that do not substantially cause afterimages, and are combined with a net whose surface is coated with metal. The CRT filter according to claim 1, which is a laminated sheet made of a resin sheet or film.
.