JPS6338374A - Crt filter - Google Patents

Abstract

PURPOSE:To protect an operator from the danger of an adverse influence caused by the electromagnetic waves, etc., by securing conduction through an optional place having no adhesion to the CRT screen via an earth line. CONSTITUTION:A CRT filter 1 has such a shape that can have adhesion to a CRT screen together with a bezel 2 unified with the filter 1 at a periphery of the filter. Then a conductive treatment B is applied via an earth line A through an optional place having no adhesion to the CRT screen. In this case, a lamination sheet consisting of a net that causes no interference fringe with a CRT scan line or has open joints to produce substantially no after-image despite the interference fringes produced together with its surface covered with a metal and a synthetic resin sheet or film is preferably used for the filter I.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to CR = "filter.

(Prior art) Word Brosse sonar, personal combination nineter, etc.
CRT display devices such as A-devices and analytical devices have become so contradictory that they have become indispensable in offices, homes, and other places. Along with this, the number of operators who come into close contact with these CRTs for long periods of time is also increasing.
1, the 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.

To prevent such negative effects, 1ffl is always
CRT filters are attached to the CRT portion of display devices.

Also, U.S. Patent No. 425373 and U.S. Pat. No. 59-10G
No. 176 proposes a removable screen filter that can adhere closely to the surface of a CRT.

(Problems to be solved by the invention) Since the commonly used CRT has a curved surface,
When installing a flat CRT filter, it often appears that the display is blurred, especially in the corners of the screen.
Therefore, the reality is that operators are inconvenienced by having to remove the CRT filter when working.

Furthermore, conventional 4M E CRT filters are
A special frame must be attached to make it removable, and the CRT filter also becomes expensive. In addition, when handling CRT filters that are structured so that they come in close contact with the CRT surface, in the manufacturing process,
Extreme care must be taken not to damage the filter surface.

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 CR1 surface, and a bezel around the filter is integrated with the filter. This is a CRT filter that allows conduction using an anis wire from any location that is not in close contact with the CR1 surface. In this case, the CRT filter has openings that do not produce interference fringes with the CRT scanning line, or even if interference fringes do not cause afterimages, and a net whose surface is coated with metal. It is preferable to use a laminated sheet made of a synthetic resin sheet 1 or a film.

In the present invention, conduction is made possible through the ground wire from any location that is not in close contact with the CR1 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 CR filter material, CI? Since the cross section of the net coated with metal is discontinuous in the peripheral cross section of the molded product formed into the T filter, this peripheral cross section is coated with metal or other conductive material, or coated with a suitable method such as vapor deposition. It is convenient to carry out the process using a ground wire from any location that is not in close contact with the CR1 surface.

FIG. 1 shows an example of the C Ri' filter according to the present invention, and the CRT filter according to the present invention can be incorporated into the display part 4 of the monitor cover 3 as shown in FIG. 2, for example. It is used in

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 net described in F has a mesh structure made of synthetic resin or metal fibers, and the opening of the net and the size of the filament 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. be done. 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 Polyethylene terephthalate neno l-(TYLV, R+ff semi-sieve 70
A laminated sheet with a thickness of 1 mm was obtained from (Methos). 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. This CR
A conductive treatment was applied so as to cover a part of the peripheral cross section of the T-filter (Fig. 1B), and the ground wire A was taken from this part.

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 greater than that of a polyethylene terephthalate net (TYLEI? standard sieve 70 mesh) on which metallic copper was vapor-deposited. A 1 mm laminated sheet was obtained. A polyvinyl chloride film coated with an acrylic adhesive (Structbond manufactured by Mitsui Toatsu Chemical Co., Ltd.) was temporarily attached to one side of the laminated sheet. A CRT filter in which the bezel 2 and the CRT filter 1 were integrally combined was obtained in the same manner as in Example.

H
-i! After processing, the ground wire was inserted from this part (Fig. 1B).

(Effect of the invention) fil C configured in a shape that can be brought into close contact with CRT
Since it has a part of the RT filter, it is excellent in terms of pre-installation, and can also prevent the UL effect caused by display blurring in a part of the corner of the screen.

Since there is no need to remove the f21 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 work without eye fatigue or resulting mental pain.

[Brief explanation of drawings]

Figure 1 shows an example of the CRT filter according to the present invention. Fig. 2 shows an example of the use of the CRT filter according to the present invention, 3 shows a part of the monitor cover, and 4 shows the display part. Patent applicant Mitsui Toatsu Chemical Co., Ltd. Engraving of the drawing (contents (No change) Figure 1 Figure 2 Tsukasa-3 U "Lne City JF #3F (Method) 19861
January/? "J

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, it is possible to conduct electricity through a ground wire from any location that does not come in close contact with the CRT surface. CRT filter. (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.