Abstract:
A computer and a method of EMI containment in a computer chassis having peripheral bays formed in its chassis, and at least two openings formed in a wall of the chassis for providing access to the at least two bays, respectively. Covers are provided for the openings and each cover overlaps its respective opening and one of the covers overlaps the other cover. The covers are interlocked with tabs formed on one of the covers which engage recessed portions formed in the other cover.

Description:
BACKGROUND 
     The present disclosure relates, in general, to a computer, or other similar electronic component, and, more particularly, to a computer and method according to which electromagnetic interference is contained. 
     It is well known that during the operation of computers, or other similar electronic components, electromagnetic interference, (EMI) emissions, or radiation, are generated in the chassis of the computer by the motors, drives, processors, chips, circuits, etc. These emissions have deleterious effects and should be contained within the chassis. Moreover, in certain situations, these emissions must be contained in order to comply with certain regulations. 
     A great majority of computers are provided with several peripheral bays which can be accessed through an opening in the front wall, or bezel, and/or the rear wall of the chassis. When one or more of the bays are not in use, a “closeout”, or cover, is usually placed over one of the above walls at the unused bays to prevent the egress of the EMI emissions from the interior of the chassis. However, although each cover is designed to completely cover a bay, gaps are often present around the covers, and especially in connection with two adjacent covers. These gaps are undesirable since they create a slot antenna gap though which the EMI emissions pass. 
     Therefore, what is needed is a cover for a peripheral bay in a computer, or other similar component, that eliminates any slot antenna gaps occurring around the shield and thus contains the emissions in the computer chassis. 
     SUMMARY 
     To this end, an embodiment of the present disclosure is directed to a computer and a method of EMI containment in a computer chassis having at least one wall, at least two peripheral bays formed in the chassis, and at least two openings formed in the wall for providing access to the at least two bays, respectively. A cover is provided for each opening and each cover overlaps its respective opening. One of the covers overlaps the other cover and is interlocked with the other cover by tabs formed on one of the covers which engage recessed portions formed in the other cover. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a diagramatic view of a computer according to an embodiment of the present invention. 
     FIG. 2 is a isometric view of the computer of FIG.  1 . 
     FIG. 3 is an enlarged exploded isometric view of the EMI shields of the computer of FIG.  1 . 
     FIG. 4 is a view similar to FIG. 3 but depicting the shields of FIG. 3 in an overlapping, interlocked relationship. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An embodiment of the present invention is shown in FIG. 1 in connection with a computer, referred to, in general, by the reference numeral  10 , which can be in the form of a server, a tower computer, a desktop computer, or the like. The computer  10  includes a chassis  12  in which a motherboard  14  is mounted. A processor  16  is connected to the motherboard  14 , and a plurality of memory devices, or modules,  18  and two input/output (I/O) devices  20  are mounted on the motherboard. Two buses  16   a  and  16   b  are also provided on the motherboard  14  and connect the processor  16  to the memory modules  18  and to the input/output devices  20 , respectively. A power supply  22  is connected to the motherboard  14 , and a pair of cable assemblies  24   a  and  24   b  connect the motherboard to a hard drive unit  26  and a disk drive unit  28 , respectively. It is understood that other components, electrical traces, electrical circuits and related devices (not shown) are provided in the chassis  12 . Since these are all conventional, they will not be described in any further detail. 
     The chassis  12  is shown in an upright, “tower” orientation in FIG.  2  and includes a front wall, or bezel  30 , which receives the two drives  26  and  28  in a conventional manner. Two openings for peripheral bays are provided through the wall  30  and are covered by two covers, or shields,  34  and  36 , respectively which are shown in better detail in FIG.  3 . 
     The shield  34  is rectangular in shape and has two snap tabs  34   a  and  34   b  formed at each end thereof. Each snap tab  34   a  and  34   b  creates a spring tension when its outer leg is pressed inwardly towards the shield. The dimensions of the shield  34  and the tabs  34   a  and  34   b  are such that the shield can be placed over its corresponding opening in the wall  30  and pressed into the opening to cause the tabs  34   a  and  34   b  to engage the corresponding portion of the wall defining the sides of the opening. Thus, the shield  34  is quickdetachably connected to the wall. The height of the shield  34  is greater than the height of its corresponding opening so that the shield overlaps the opening. 
     The shield  34  also has two spaced tabs  34   c  and  34   d  formed along one edge portion, which is its lower edge portion as viewed in FIG. 3, with a notch  34   e  being defined between the tabs. Two recessed portions  34   f  and  34   g  are also formed along the upper edge portion of the shield  34 , for reasons to be described. 
     The shield  36  is identical to the shield  34  and, as such, has two snap tabs  36   a  and  36   b  formed at each end thereof which function in the same manner as the snap tabs  34   a  and  34   b  of the shield  34 . The shield  36  also has two tabs  36   c  and  36   d  and a notch  36   e  formed along its lower edge portion, and two recessed portions  36   e  and  36   f  formed along its upper edge portion. 
     The shields  34  and  36  are shown in their interlocked position in FIG.  4 . In this position, the tabs  34   c  and  34   d  of the shield  34  overlap the upper edge portion of the shield  36  and extend in the recessed portions  36   f  and  36   g  of the shield  36 . Also, the notch  34   e  of the shield  34  receives that portion of the upper edge portion of the shield  36  extending between the recessed portions  36   f  and  36   g . Thus, the shields  34  and  36  are retained in the overlapped, interlocked relationship shown in FIG.  4 . 
     The recessed portions  34   f  and  34   g  of the shield  34  are adapted to receive the tabs of an adjacent shield (not shown) covering an additional opening in the wall  30  extending above the opening covered by the shield  34 . Also, the tabs  36   c  and  36   d  of the shield  36  are adapted to interlock with an adjacent shield (not shown) covering an additional opening in the wall  30  extending below the opening covered by the shield  36 . 
     As a result of the foregoing, the shields  34  and  36  are retained in an overlapping, interlocked relationship, thus eliminating any slot antenna gaps occurring around each shield and between the shields, and preventing the egress of EMI emissions or radiation from the interior of the chassis  12 . 
     It is understood that several variations may be made in the foregoing without departing from the scope of the invention. For example, the number of shields, and therefore the number of peripheral bays covered by the shields can be varied within the scope of the invention. Also, the embodiment described above is not limited to the use of a computer in a tower orientation, but is equally applicable to other types of computers and orientations of the computers. Moreover, the embodiment described above is equally applicable to other electronic components. 
     Other modifications, changes and substitutions are intended in the foregoing disclosure and in some instances some features of the disclosure will be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the disclosure.