JPS6363082A - 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).
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 CR7 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, conventional CRT filters require a special frame to be attached so that they can be removed.
CRT filters are also becoming expensive, and when handling CRT filters that are structured to come into 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 be brought into close contact with the CRT surface, and a bezel around the filter is integrated with the filter. This is a CRT filter in which holes are formed at arbitrary locations that do not come into close contact with the CRT surface, the perforations are treated with a conductive material as necessary, and electricity can be conducted from the perforations through a ground wire. In this case, 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 laminated sheet made of a resin sheet or film is preferable.

In the present invention, a hole is formed at an arbitrary location that does not come into close contact with the CRT surface, and if necessary, the hole is treated with a conductive material, and then electricity can be conducted from the hole through a ground wire.
When using an fI layer sheet made of a net whose surface is coated with metal and a synthetic resin sheet or film as a material for a CRT filter, if the peripheral edge of the molded CRT filter is perforated, the perforated portion Since the cross section of the net covered with metal will be discontinuous, this cross section should be coated with metal or other conductive material, subjected to appropriate treatment such as vapor deposition, and then connected to the ground wire. 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 by being incorporated into a display section 6 of a monitor cover 5 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 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, (D), etc. A sheet laminated by a conventional method using a metal-coated net and a sheet or film obtained from a synthetic resin.

get the money.

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 11I was obtained from a polyethylene terephthalate net (TYLER standard sieve 70 mesh) on which a polyvinyl chloride sheet and metallic copper were vapor-deposited. Using this laminated sheet, a CRT filter in which a bezel 2 and a CRT filter 1 were integrally combined as shown in FIG. 1 was obtained by air pressure molding using an aluminum mold. Perforations 4 were provided by perforating the peripheral edge 3 of this CRT filter. A conductive paint was applied to cover the cross section of the perforated portion 4 to perform conductive treatment (FIG. 1B), and the ground vAA was taken from this portion.

Note that in FIG. 1, the perforation and the ground wire are shown in different positions to facilitate understanding.

Example 2 A high nitrile resin sheet (manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name "Baresox") was used instead of a polyvinyl chloride sheet, and the thickness was 1 from a polyethylene terephthalate net (TYLERIII semi-sieve 70 mesh) on which gold rXw4 was vapor-deposited. - A laminated sheet was obtained. A polyvinyl chloride film coated with an acrylic adhesive (Struct Bond manufactured by Sikata Toatsu Kagaku ■) as an adhesive was temporarily attached to one side of this laminated sheet. Bezel 2 and CRT in the same manner as in Example 1
A CRT filter in which filter l was integrally combined was obtained. Example 1
In the same way as above, I took the ground wire A 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.

+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 electromagnetic waves, etc. (3) The molding process is easy, so it can be finished at a low cost.

(4) Since so-called MO[RE interference fringes do not occur on the CRT screen, the operator can work without worrying about the mental pain caused by this.

[Brief explanation of the drawing]

Figure 1 shows an example of a CRT filter according to the present invention, where 1 is a part of the CRT filter, 2 is a bezel portion, 3 is a bezel periphery, 4 is a perforation, A is a ground wire, and the blacked out part. B indicates each location subjected to conductive treatment. FIG. 2 shows an example of the use of the CRT filter according to the present invention, in which numeral 5 indicates a part of a monitor cover and numeral 6 indicates a display section. Patent applicant: Mitsui Toatsu Chemical Co., Ltd. Figure 2

Claims (2)

[Claims] (1) In a CRT filter that has a shape that allows it to come into close contact with the CRT surface, and in which the bezel around the filter is integrated with the filter, a hole is drilled at any location that does not come into close contact with the CRT surface, and if necessary, A CRT filter in which the perforations are treated with a conductive material and electricity can be conducted from the perforations through a ground wire. (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. CR according to claim 1, which is a laminated sheet made of a resin sheet or film.
T filter.