JPH0529196U - Magnetic shield box - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Covering the shield plate used for TV etc.,
(EN) Provided is a magnetic shield box which improves aesthetics and can be adapted to TVs of various sizes. [Structure] Shield plate 1 in L-shaped synthetic resin cover
2 are arranged, the ends of the shield plates are overlapped, and four covers 11 are used to form a box shape and set in a television or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic shield box for preventing discoloration or shaking of images on a color television, color monitor or the like or shaking of images on a monochrome television, monitor or the like.

[0002]

[Prior Art]

 In a color television and a color monitor having a cathode ray tube, an electron beam from an electron gun strikes R, G, and B phosphors to form each color. Recently, color televisions and color monitors have become large in size and have become thinner, so that the flight angle of the electron beam in the cathode ray tube has changed from 90 ° to 110 ° in the past. The image produced by such a structure is very sensitive to the magnetic field of the outside world and deviates from the trajectory of the electron beam flying by a slight magnetic field, so that a predetermined image is not formed. That is, in a static magnetic field, a color change phenomenon occurs, and in an AC magnetic field, an image shake phenomenon occurs.

As a cause of the static magnetic field, there are railways that use direct current, magnets (normal conducting and superconducting magnets) that are used in MRI, speakers, magnets, and electric devices that use direct current. is there. In addition, as a source of an AC magnetic field that causes a problem of shaking, there are a transmission line, a transformer, or an electronic or electric device using a transformer. Since these sources are increasing and the cathode ray tube is becoming more sensitive, manufacturers are taking magnetic shielding measures. In other words, an internal shield that puts a soft magnetic material in the cathode ray tube and an external shield that puts a soft magnetic material between the housing and the cathode ray tube have been studied and implemented, but they are insufficient to eliminate image troubles. I haven't arrived.

[0004]

[Problems to be solved by the present invention]

 The discoloration and shaking phenomenon of an image differ depending on the direction of the magnetic field, and it is necessary to consider various countermeasures. To obtain a normal image, a double or triple shield is applied by an external shield that puts a TV or monitor in a shield box made of soft magnetic material. Examples of soft magnetic materials include pure iron, silicon copper, permalloy, and amorphous metal. When constructing a shield box with these materials, it may be necessary to consider the structural means such as welding or using a reinforcing material, so that the weight may be increased, and heat treatment such as strain removal may be required to improve the characteristics. Due to the appearance problem, it was difficult to use because the price was high because it used separate interior and exterior materials. A magnetic shield is absolutely indispensable when judging information from images such as medical equipment and control equipment, and a low-priced shield box is desired to enjoy the TV, which is now indispensable in everyday life at home. ..

Further, each maker that manufactures color televisions and color monitors employs its own external dimensions. For this reason, even if a standard type shield box is provided, the number of color televisions and color monitors that can use this shield box is limited. Therefore, until now, shield boxes suitable for each television and monitor have been provided, but such provision is expensive due to the small number of shield boxes and various types.

Therefore, in order to solve these problems, an L-type soft magnetic material shield plate having a bent portion was provided as a low-cost magnetic shield box that can be easily installed (actual application, flats 1-313398 and flats). 1-31399). In this technology, a bent part is applied to a corner of a TV and the end of this shield plate is overlapped with the end of another shield plate to form a box shape.

As the magnetic shield plate, pure iron, silicon steel, permalloy, and magnetic amorphous material are used to bend the path by passing the magnetic field in one space through the material and not to reach the other space. A high magnetic permeability soft magnetic material such as an alloy is used.

Separately from this, the magnetic object is an alloy powder having a composition of Al 2 to 7% by weight, Si 3 to 8%, Ni 6% or less, the balance Fe and unavoidable impurities, and an average thickness of 0.5. It may be a shield plate having a layer of a substance obtained by mixing the flat alloy powder having an average major axis of 5 to 100 μm with an organic binder. Moreover, even if a flaky soft magnetic amorphous alloy piece having a thickness of 5 to 100 μm and an aspect ratio of 10 to 15000, which is a ratio of the maximum length to the maximum thickness, is adhered to a magnetic object, a layer is formed. Good.

FIG. 1 shows an L-shape, and the plate width C has a great influence on the magnetic shield characteristics and is sufficient if it is at least the length of the cathode ray tube, but if it is 100 mm or more because it becomes a problem in terms of cost and appearance. Can be magnetically shielded. The dimensions of A and B are different depending on the size of various TVs and monitors, so it is not possible to decide unconditionally, but if there is a gap or a butt when constructing the box, a magnetic flux leaks from it, so it must be wrapped. .. The dimension D shown in FIG. 2 must be a dimension that ensures 10 mm or more. It is preferably 50 mm or more.

As shown in FIG. 2, the shield box can be constructed simply by fixing the L-shaped shield plate 1 directly to the TV or monitor 2 so that A and B can wrap, and In addition, the weight can be reduced.

On the other hand, since the wrap portion is present, a seam appears at the upper portion and the lateral portion of the shield box, which is not aesthetically preferable. Next, in the case of a box with an integrated structure, since each television is individually handled, it becomes a large quantity in small quantities and expensive. Furthermore, the packaging of these shield boxes has the disadvantage of being bulky and bulky with respect to the actual body, resulting in high transportation costs.

Therefore, it is an object of the present invention to solve the problems of the prior art and to provide a shield box that can be easily installed at a low price and keeps its aesthetic appearance.

[0013]

[Means for solving the problem and its action]

 SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention forms a box type by overlapping the end of an L-shaped shield plate made of a soft magnetic material and having a bent portion with the end of another adjacent shield plate. The magnetic shield material is incorporated into the cover of the resin molded product. When creating a magnetic shield box, if there is a gap or butt between the shields, leakage magnetic flux will be generated from that gap, so each shield plate must be wrapped.

More specifically, the present invention relates to a plurality of L-shaped and channel-shaped cross-section synthetic resin covers, and a plurality of L-shaped soft magnetic materials arranged along the inside of the covers. And a shield plate of which the one end of the shield plate extends from one end of the cover and overlaps with the shield plate of the adjacent cover side to provide a box-shaped magnetic shield box. ..

The necessity of the wrap portion of the shield plate is unfavorable in appearance because the end portions of the shield plate are present between the covers. Therefore, it is preferable that the end of the shield plate is covered with the wrap to improve the appearance as an interior.

[0016]

【Example】

 The magnetic shield box 10 has, as shown in FIG. 3, four covers 11 and a shield plate 12 arranged therein. The cover 11 is made of synthetic resin having a channel-shaped cross section and is formed into an L shape. The height of the facing walls 13 is equivalent to or slightly higher than that of the two shield plates 12. At both ends of the cover 11, the retaining plates 14 are formed integrally or separately so that they can be fitted and stopped. One piece of the cover 11 is longer than the other piece.

As shown in FIG. 5, the shield plate 12 is L-shaped, and has the same material and shape as described with reference to FIGS. 1 and 2. One piece 15 of the shield plate 12 is made longer than the other piece 19, and the longer piece 15 extends out from the cover 11 when assembled in the cover 11.

One of the retaining plates 14 of the cover 11 shown in FIG. 4 is removed, the shield plate 12 is put into the cover 11, and the removed retaining plate 14 is fixed to the cover 11. In the example of FIG. 4, a part of the shield plate 12 extends rightward from the horizontal piece of the left cover 11, and a part of the shield plate 12 extends upward from the vertical piece of the right cover 11. Postpone. Another such set is made, a part of the shield plates 12 extending from the cover 11 is inserted into the adjacent covers 11, and the ends of the shield plates 11 overlap each other.

In this way, the four covers 11 are connected in a box shape via the shield plate 12 and set in a television or the like as shown in FIG. When setting, the corner of the cover 11 is applied to the corner of the TV or the like so that the ends of the covers 11 are brought into contact with each other.

However, since televisions and the like have various sizes, a gap is formed between the covers 11 and the shield plate 12 is exposed, which is not preferable. Therefore, as shown in FIG. 4, a rectangular joint projecting member 16 made of synthetic resin is used. The joint member 16 is attached to a part of the shield plate 11 extending from the cover 11 to minimize the exposure of the shield plate 11 as described above. In the example shown in FIG. 3, six joining members 16 are provided on the upper and lower sides, and three joining members 16 are provided on the left and right sides, but the number may be increased or decreased as necessary.

Instead of the joint member 16, as shown in FIG. 6, the protruding piece 17 is extended from the upper side of the horizontal piece of the one cover 11, and the protruding piece 17 ′ is extended from the lower side of the horizontal piece of the other cover 11. Alternatively, the protruding piece 18 may extend upward from the outside of the vertical piece of the cover 11 and the protruding piece 18 ′ may extend from the inside of the vertical piece of the other cover 11. In any case, the end of the shield plate of the cover 11 must be overlapped with the end of the remaining shield plate.

In this case, after assembling the shield plate 12 in each cover 11, the protrusions 17, 17 ′, 18, 18 ′ are adjacent to each other so that the corners of the cover 11 hit the corners of the TV or the like. By inserting into the bar 11, it is set on a television or the like. The amount of insertion of the projecting piece into the adjacent cover 11 differs depending on the size of the TV or the like.

[0023]

【effect】

 It is of high practical value because it can be installed on site easily by simply connecting four covers and a set of shield plates so that the ends of the shield plates overlap each other, and can be adapted to TVs of various sizes.

[Brief description of drawings]

FIG. 1 is a perspective view of a shield plate.

FIG. 2 is a front view showing a relationship between a shield plate and a television or the like.

FIG. 3 is a front view of an example of the present invention.

FIG. 4 is a perspective view of a cover used in the present invention.

FIG. 5 is a perspective view of a shield plate used in the present invention.

FIG. 6 is a perspective view of a modification of the cover used in the present invention.

[Explanation of symbols]

 11 cover 12 shield plate 14 retaining 16 joint member 17, 18 projecting piece

Claims (4)

[Scope of utility model registration request] 1. A plurality of L-shaped and channel-shaped cross section covers made of synthetic resin, and a plurality of shield plates made of L-shaped soft magnetic material arranged along the inside of the covers, A magnetic shield box in which one end of the shield plate extends from one end of the cover and is overlapped with a shield plate on the adjacent cover side so that the cover has a box shape. 2. The magnetic shield box according to claim 1, wherein retaining plates are provided inside both ends of the cover. 3. The magnetic shield box according to claim 1, further comprising a joint member that covers the shield plate between the adjacent covers. 4. The magnetic shield box according to claim 1, wherein a protrusion plate integral with the cover is provided from one end of the cover, and the protrusion plate is inserted into the adjacent cover.