JPS6326601A - Crt filter - Google Patents

Abstract

PURPOSE:To prevent the blurring of the display in the corner part of a screen by forming a CRT filter of a laminated sheet consisting of a net which has the opening mesh to obviate the generation of interference fringes with CRT scanning lines or to allow the formation of the interference fringes to the extent of forming substantially no after-images and is coated with a metal on the surface and a synthetic resin sheet or film. CONSTITUTION:The CRT filter 1 is used by being built into the display 4 part of a monitor cover 3 and consists preferably of a high nitrile resin in terms of adhesiveness and moldability. The filter is constituted of the sheet or film consisting of such synthetic resin and the net which has the opening mesh to obviate the generation of the interference fringes with the CRT scanning lines or to allow the formation of the interference fringes to the extent of forming substantially no after-images and is coated with the metal on the surface. This net has the network structure consisting of the synthetic resin or metallic fibers and the opening mesh of the net is usually <=100 mesh, more preferably <=70 mesh. The net surface is further coated with the metal. The laminated sheet is obtd. by an ordinary method using the net coated with the metal in the above- mentioned manner and the sheet or film obtd. from the synthetic resin.

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 AI devices and analytical instruments 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 tearing of the optic nerve, and although the scientific causal relationship has not been fully elucidated, consideration must be given to the risk of adverse effects from exposure to TM 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.

(Problem 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 to be obscured, especially at a corner of the screen. The reality is that operators are inconvenienced by having to remove the CRT filter when working.

Furthermore, it is necessary to attach a special frame to the CRT filter so that it can be removed, and the CRT filter also becomes expensive.

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 be brought into close contact with the CRT surface, and a bezel around the filter is integrated with the filter. 1. 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 made of a net whose surface is coated with metal and synthetic resin. This CRT filter is characterized by being a laminated sheet made of sheets or films.

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 by being incorporated into the display portion 4 of a monitor cover 3 as shown in FIG. 2, for example. It is something that will be done.

The CRT filter according to the present invention can be made of, for example, polyvinyl chloride resin, high nitrile resin, polyether ether ketone resin, polyether sulfone resin, polycarbonate, diethylene glycol bisallyl carbonate, polyethylene terephthalate, polymethyl methacrylate, acrylonitrile-styrene copolymer. High nitrile resins are preferable from the viewpoint of adhesion and moldability, especially when combined, and the sheets or films made of these synthetic resins do not produce interference fringes with CRT scanning lines, or even if they do, interference fringes do not substantially cause afterimages. It is composed of a net that has no openings and whose surface is coated with metal.

The net 7) has a mesh structure made of synthetic resin or metal fibers, and the opening of the net is usually 100 meshes or less, preferably 70 meshes or less, especially 70 meshes when the CRT is 12 inches. Anything below mehshiyu is good. 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.

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 with a thickness of 11 was obtained from a polyvinyl chloride sheet and a polyethylene terephthalate net (TY [, ER standard sieve 70 mesh) on which metal copper was vapor-deposited. A CRT in which a bezel 2 and a CRT filter 1 are integrally combined using this laminated sheet and an aluminum mold as shown in Figure 1.
A filter was obtained by pressure molding.

Example 2 A high nitrile resin sheet (manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name "Barefkus") was used instead of a polyvinyl chloride sheet, and the thickness was 1.1 mm from a polyethylene terephthalate net (TYLER standard sieve 70 mesh) on which metallic copper was vapor-deposited.
A laminated sheet of mm was obtained. In the same manner as in Example 1, a CRT filter in which the bezel 2 and the CRT filter 1 were integrally combined was obtained.

(Effects of the invention) (11 CR configured in a shape that allows close contact with CRT
Since it has a part of the T filter, it has an excellent design and can also prevent the phenomenon of display blurring in a part of the corner of the screen.

(2+ 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 electromagnetic 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, the operator can avoid hearing fatigue and, based on this,
You can work without incurring divine pain.

[Brief explanation of drawings]

FIG. 1 shows an example of a CRT filter according to the present invention, where l indicates a portion of the CRT filter and 2 indicates a bezel portion. FIG. 2 shows an example of the use of the CRT filter according to the present invention, in which numeral 3 indicates a part of a monitor cover and numeral 4 indicates a display section. Patent applicant: Mitsui Toatsu Chemical Co., Ltd. Engraving of drawings (no changes to content) Figure 1 Figure 2 Procedure, + Hosho (method) % formula % ■, Indication of the incident Patent Application No. 169678, 1985 , Name of the invention CRT filter 3, Relationship with the person making the amendment Patent applicant address 3-2-5-4 Kasumigaseki, Chiyoda-ku, Tokyo Date of amendment order (shipment date) September 30, 1985 5 Target of correction

Claims (1)

[Claims] A CRT having a shape that can be closely attached to a CRT surface, and in which a bezel around the filter is integrated with the filter.
In the filter, 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. A CRT filter characterized in that it is a laminated sheet made of a resin sheet or film.