Television – Video display – Cabinet or chassis
Reexamination Certificate
1998-03-04
2001-05-29
Wilkens, Janet M. (Department: 3636)
Television
Video display
Cabinet or chassis
C348S839000
Reexamination Certificate
active
06239849
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application entitled Electromagnetic Wave Shield and Monitor with Such a Shield earlier filed in the Korean Industrial Property Office on Mar. 5, 1997, and there duly assigned Serial No. 1997/3779 by that Office.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic wave shield and, more particularly, to an integrated plastic shield suitable for shielding the electromagnetic waves of a cathode ray tube usable with a display device.
2. Background Art
The recent trend of enlarging monitors and improving the resolution of monitors has resulted in the generation of a large amount of electromagnetic waves by the cathode ray tubes used in the newer monitors. Such electromagnetic waves sometimes cause interference in electronic equipment around the monitor, thus causing operational errors in nearby electronic equipment. Additionally, electromagnetic waves from the cathode ray tube can be injurious to one's health, thus the amount of electromagnetic waves discharged into the atmosphere should be kept to a minimum level. In order to limit the amount of discharged electromagnetic waves, various types of shields may be used with monitors.
An electromagnetic shield is comprised of highly conductive metal sheets that are formed through a pressing process prior to being integrated into a predetermined configuration through a fastening process. That is, 15 to 30 metal sheets have to be assembled into a shield using a plurality of fasteners, thus complicating the production process of the shield. In addition, the elements of the typical shield are formed of 3 to 5 different kinds of materials. This handling of various components of various materials reduces production efficiency due to a more complicated assembling process to combine the necessary elements into a shield. When a monitor is being assembled, it is necessary to first connect a degaussing coil to the shield prior to mounting the shield onto the cathode ray tube. This further reduces the manufacturing productivity during the production process of monitors. The degaussing coils are connected to the shield to prevent the reduction of image quality due to the electromagnetic waves of the cathode ray tube. Terminals are located on the cathode ray tube to ground the shield, but they are also problematic because the terminals increase the number of different materials used with the shield and reduce the grounding effect of the shield due to non ideal contact between the terminals and the cathode ray tube. High voltage current flows through the degaussing coil that may be connected to the shield using fixing members integrated with the metal sheets or by using separate cable ties. The electromagnetic shield may be constructed of metal sheets giving the shield many sharpened edges that may cause unexpected damage to the covered coils. When the covered coils are unexpectedly damaged by the sharpened edges of the shield, they may short circuit and cause serious damage to the monitor.
Contemporary electromagnetic shields are time consuming to assemble, involve various components, can cause gouges in the tape used to cover degaussing coils, and are not easily recyclable due to the multitude of different materials used in the constructing an electromagnetic shield. I believe that it may be possible to improve the current art by providing an electromagnetic wave shield that is formed of a single structure, that has a simpler assembly process, that does not generate noise when the cathode ray tube is magnetized by a degaussing coil, that does not have any sharp edges, that has improved durability, that increases the efficiency of production, that can be produced more economically, that is conveniently recyclable, and that is suitable for use in monitors.
SUMMARY OF THE INVENTION
Accordingly, it as an object of the present invention to provide an electromagnetic wave shield for monitors, that is formed into a single structure that is free from requiring any additional assembling process thus improving manufacturing efficiency while assembling monitors and improving the manufacturing productivity for the monitors.
It is another object to provide an electromagnetic wave shield for monitors, that is formed of conductive plastic without having any sharpened edges thus to prevent causing any damage to the elements around the shield, stabilizing the operation of a monitor, improving durability of the monitor, and effectively almost completely grounding the cathode ray tube.
It is still another object to provide an electromagnetic wave shield that is conveniently recyclable.
It is yet another object to provide an electromagnetic wave shield for monitors, that does not generate any irritating operational noise when the cathode ray tube is magnetized by a degaussing coil.
It is a further object to provide a monitor that uses the electromagnetic wave shield of the present invention.
To achieve these and other objects, an electromagnetic wave shield for monitors may be constructed using resin in combination with a plurality of elastic ground terminals for grounding both the band and the funnel of a cathode ray tube that is integrated with the shield during the molding process.
The present invention also provides a monitor with a cathode ray tube that may be constructed using a front cover; a rear cover assembled with the front cover into a monitor casing containing a cathode ray tube; and an electromagnetic wave shield mounted in the monitor casing to shield the electromagnetic waves of the cathode ray tube. The shield may be integrated using an ear mount to allow each ear of the cathode ray tube to be mounted to the front cover with the ear mount being interposed between each ear and the front cover; an electromagnetic wave shielding part covering a funnel of the cathode ray tube; a plurality of elastic ground terminals coming into elastic contact with both band and funnel of the cathode ray tube, thus grounding the band and funnel; and a high voltage wire inlet opening allowing a high voltage wire to pass through the covers prior to being connected to an anode of the cathode ray tube.
In another embodiment of this invention, the electromagnetic wave shield may be integrally formed of nonconductive resin through a molding process prior to being coated or plated with a conductive material on its surface.
REFERENCES:
patent: 4853790 (1989-08-01), Dickie
patent: 4858016 (1989-08-01), Suehiro et al.
patent: 5349132 (1994-09-01), Miller et al.
patent: 5351920 (1994-10-01), Decky et al.
patent: 5510827 (1996-04-01), Kubota et al.
patent: 5793494 (1998-08-01), Douken et al.
patent: 5806940 (1998-09-01), Heirich
Bushnell , Esq. Robert E.
Samsung Electronics Co,. Ltd.
Wilkens Janet M.
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