JPS6338980A - 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.

(Conventional technology) O of word processing sensors, 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 also increasing, and occupational diseases of operators are increasingly being taken up as a social problem in developed countries. A common symptom of this occupational disease is fatigue 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 t-magnetic waves, static electricity, ultraviolet rays, etc.

In order to prevent such adverse effects, a CRT filter is usually attached to cover the CR7 portion of the CRT display device.

Also, U.S. Patent No. 425373 and Utility Model Publication No. 59-1.0
In No. 6176, a removable screen filter that can be closely attached to the CRT surface is introduced. ! has been done.

(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.

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

(Means for Solving the Problems) That is, in the CRT filter according to the present invention, in a CRT filter having a shape that can accommodate the CRT tip portion and come into close contact with the CRT surface, the CRT filter can be removed from any location that does not come into close contact with the CRT surface. CRT that allows conduction through the ground wire
It's a filter.

In this case, the 3g 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.

In the present invention, electricity can be conducted through the ground wire from any location that is not in close contact with the CRT surface.

When a laminated sheet consisting of a net whose surface is coated with metal and a synthetic resin sheet or film is used as a CRT filter material, the peripheral cross section of the molded CRT filter is coated with metal. Since the cross-section of the net is discontinuous, the peripheral cross-section must be coated with metal or other conductive material, vapor-deposited, or otherwise appropriately treated, and then connected to the ground wire from any location that does not come into close contact with the CRT surface. It is advantageous to be able to conduct electricity.

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 manner such that it is placed over the tip of a CRT as shown in FIG. 2, for example. be.

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 in terms of adhesion and moldability, especially when combined, and the sheets or films made of these synthetic resins do not cause interference fringes with the CRT scanning line, or even if they do, the interference fringes cause substantial afterimages. It is preferable to use a net having no openings and whose surface is coated with metal.

The above-mentioned 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 and size of the cathode ray tube, 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.

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 1 mm was obtained from a polyvinyl chloride sheet and a polyethylene terephthalate net (TYLER standard sieve 70 mesh) on which metal copper was vapor-deposited. Using this laminated sheet, a CRT filter as shown in FIG. 1(a) was molded by air pressure using an aluminum mold. A conductive treatment was applied so as to cover the cross section of the peripheral edge of this CRT filter (FIG. 1(a)B), and the ground fiA was taken from this part.

Example 2 A high nitrile resin sheet (manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name "Barefux") was used instead of the Bo1JIHts vinyl sheet, and the thickness was 1InI11 from polyethylene terephthalate neft (TYLERI semi-sieve 70 mesh) on which metallic copper was vapor-deposited. I got a laminated sheet. In the same manner as in Example 1, a CRT filter as shown in FIG. 1 (b) was obtained. . Conductive treatment is applied to cover the peripheral cross section of this CRT filter.
I got an A.

Example 3 A CRT filter as shown in FIG. 1(C) was obtained in the same manner as in Example 1 using the 1 mm laminated sheet used in Example 2. A conductive treatment was applied so as to cover the cross section of the peripheral edge of this CRT filter (FIG. 1(c) B), and the ground vAA was taken from this part.

(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.

Since there is no need to remove the f2+ 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.

+41 The CRT filter according to the present invention is a so-called MO
II? Since E-interference fringes do not appear on the CRT screen, the operator can work without eye fatigue or mental distress.

[Brief explanation of the drawing]

FIG. 1 shows an example of a CRT filter according to the present invention, in which A indicates a ground wire, and a further shaded area B indicates a portion subjected to conductive treatment. FIG. 2 shows an example of the use of the CRT filter according to the present invention, in which 1 shows a part of the CRT filter, 2 shows the CRT, and A
indicates the ground wire. Patent applicant: Mitsui Toatsu Kagaku Co., Ltd. (method) November 1986 IP date

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,
A CRT filter that allows conduction through a ground wire from any location that is not in close contact with the T-plane. (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.