Abstract:
A computer chassis for covering and protecting the components of a data processing system. In a preferred embodiment, the computer chassis includes a chassis bezel. The chassis bezel has a slotted opening there through for allowing a user to access a user changeable component in the data processing system. The chassis bezel is configured to accept a cover plate that will cover the slotted opening thus preventing access to the user changeable component.

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field: 
     The present invention relates to computer systems and, more particularly, to computer chassis. Even more particularly, the present invention relates to methods of providing secure external access to flash memory cards within a computer. 
     2. Description of Related Art: 
     In a flash memory it is desired to write data in the fastest manner possible. As such, multiple bytes of data are often written to the memory in one write operation. Because flash write operations are not always successful on a first memory cell program operation, data check and rewrite operations are often employed. Thus, a write operation is conducted on a group of memory cells and the state of the memory cells following the write operation is determined. If any of the memory cells have not been written to a correct logic state, a second write operation is performed on the same memory cells. Often flash memory is implemented as flash memory cards inserted into an expansion slot within a computer system. 
     Typically, flash memory cards are mounted internally within the system chassis. However, certain market segments have expressed desires to have user access to the flash card from the outside of the system for serviceability and usability reasons. Continuing to mount the flash memory cards internally within the system chassis encumbers these customers access to the flash memory cards because the chassis must be disassembled to gain access to the cards. However, other market segments do not want users to have access to the flash memory cards due to reasons of theft or compromised system security. 
     Therefore, it is desirable to have a system that allows easy access to the flash memory card under certain circumstances that is easily convertible to a secure system disabling user&#39;s access to the flash memory card when desired by a customer. 
     SUMMARY OF THE INVENTION 
     The present invention provides a computer chassis for covering and protecting the components of a data processing system. In a preferred embodiment, the computer chassis includes a chassis bezel. The chassis bezel has a slotted opening there through for allowing a user to access a user changeable component in the data processing system. The chassis bezel is configured to accept a cover plate that will cover the slotted opening thus preventing access to the user changeable component. Once the cover plate has been mounted to the chassis bezel, access to the user changeable component may not be reestablished without opening the entire chassis. This type of access may also be denied by requiring the use of specialized non-standard tools to open the computer chassis. Thus unauthorized removal of the user changeable component may be prevented. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein: 
     FIG. 1 shows a perspective view of a computer chassis in accordance with a preferred embodiment of the present invention; 
     FIG. 2 shows a close up perspective view of a chassis bezel and a cover plate in accordance with a preferred embodiment of the present invention; 
     FIG. 3 shows a side view of a computer chassis in accordance with a preferred embodiment of the present invention; 
     FIG. 4 shows a side cross-sectional view of a computer chassis in accordance with a preferred embodiment of the present invention; and 
     FIG. 5 shows a top view of a chassis bezel and a cover plate in accordance with a preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference now to the figures, and in particular with reference to FIG. 1, a perspective view of a computer chassis is illustrated in accordance with a preferred embodiment of the present invention. Computer chassis  100  has a base  125  that supports computer chassis  100 . Connected to base  125  is cover  120 . Cover  120  is a continuous piece of material and comprises three sides: a top side  135 , a right side (not shown) and a left side  130 . 
     The front of computer chassis  100  comprises a chassis bezel  110 . Preferably, cover  120 , chassis bezel  110 , and base  125  are constructed from the same type of material. Chassis bezel  110  includes a power on/off button  111 , an LED status indicator  112 , audio jack outputs  114  for connecting external audio speakers to the computer housed within computer chassis  100 , a microphone input  115  for connecting an external microphone to the computer housed within computer chassis  100 , and a flash memory card slot  113  for receiving flash memory cards. 
     Flash memory card slot  113  defines an opening through chassis bezel  110  through which a flash memory card (not shown) may be inserted. The flash memory card once inserted through flash memory card slot  113  would engage internal computer components within computer chassis  100  thus providing an electrical interface between the flash memory card and the computer allowing for communication between the computer and the flash memory card. If a user chooses to remove the flash memory card, the user merely grasps the externally accessible portion of the flash memory card that protrudes outside the surface of chassis bezel  110  and exerts a small amount of force to disengage the flash memory card from the interface thus pulling the flash memory card out through flash memory card slot  113 . With the flash memory card thus removed, a new flash memory card may be inserted in its place. 
     Thus, by providing flash memory card slot  113 , users may have access to the flash memory cards without the hassle of opening computer chassis  100  and removing the flash memory card from the interior of computer chassis  100 . 
     Also depicted in FIG. 1 is a cover plate  140 . Cover plate  140  is configured such that it slides over a flash memory card and into flash memory card slot  113 . Note, cover plate  140  can be placed over the flash memory card both after the flash memory card has been inserted into flash memory card slot  113  and simultaneously with or before insertion of the flash memory card into flash memory card slot  113 . Once engaged within flash memory card slot  113 , cover plate  140  may not be removed by a user without opening computer chassis  100  to reveal the backside (interior) of chassis bezel  110 . Thus, by using cover plate  140 , access to the flash memory card may be denied thus adding additional security to the computer that may be desired by some users. 
     Turning now to FIG. 2, a close up perspective view of chassis bezel  110  and cover plate  140  is depicted in accordance with a preferred embodiment of the present invention. Cover plate  140  comprises three planer members  141 - 143 . Planer members  142  and  143  are parallel (or at least substantially parallel) to each other. Planer members  142  and  143  are substantially orthogonal to planer member  141 . Planer members  142  and  143  are separated or connected to each other via their connection to planer member  141 . Except for the area in which planer member  142  is connected to planer member  143  by planer member  141 , planer members  142  and  143  are separated by empty space with such thickness defined by the width  150  of planer member  141 . The dimensions of the various components of cover plate  140  are determined by the dimensions of the flash memory card for which cover plate  140  is designed to enclose or encapsulate. Cover plate  140  should be of a size that may slide over the flash memory card with sufficient spatial tolerance between cover plate  140  and the flash memory card. 
     Cover plate  140  includes biasing members  146  and  147 , which are retention clips and are typically spring back tabs, on planer member  142  and corresponding biasing members (not shown) on planer member  143 . (Note, the spring back tabs may be constructed from materials such as, for example, plastic or metal). Biasing members  146  and  147  as well as those (not shown) on planer member  143  are configured such that the tabs close in response to pressure as cover plate  140  is inserted into chassis bezel  110  and spring back into place after insertion is complete. Thus, removal of cover plate  140  is precluded since the biasing members “catch” on the interior of chassis bezel  110  if removal is attempted. 
     Turning now to FIG. 3, a side view of computer chassis  100  is illustrated in accordance with a preferred embodiment of the present invention. In this illustration, the flash memory card  301  is shown inserted into chassis bezel  110 . Cover plate  140  is shown and would be placed over flash memory card  301  as indicated by the arrows. As illustrated in FIG. 3, a portion of flash memory card  301  extends out from the surface of chassis bezel  110  allowing a user an area to grasp such that flash memory card  301  may be inserted and removed from the computer. 
     Turning now to FIG. 4, a side cross-sectional view of computer chassis  100  is illustrated in accordance with a preferred embodiment of the present invention. In this illustration, cover plate  140  is inserted into flash memory card slot  113  over flash memory card  301 . Biasing members  146  and  147  are engaged by the back side of chassis bezel  110  such that removal of cover plate  140  is precluded. If the user desires to have access to flash memory card  301 , then computer chassis  100  must be opened by opening or removing cover piece  120  such that access to the back side of chassis bezel  110  is obtained. Alternatively, chassis bezel  110  may be secured to chassis  100  using security screws and access to the back side of chassis bezel  110  may be gained by removing chassis bezel  110  from cover piece  120  using a security tool. Once access to the back side of chassis bezel  110  is obtained, cover plate  140  may be removed by squeezing biasing members  146  and  147  (and the corresponding tabs (not shown) on the other side of cover plate  140 ) together such that the tabs do not “catch” on the back side of chassis bezel  110 . Once the tabs have been squeezed together, cover plate  140  may be removed by gently pulling out through the front of chassis bezel  110 . As is illustrated in FIG. 4, cover plate  140  does not cover the entire surface of flash memory card  301 , but only covers the portion of flash memory card  301  that is exposed outside of chassis bezel  110  and only so much of flash memory card  301  within the interior of computer chassis  100  as is necessary to secure cover plate  140  to chassis bezel  110 . 
     Turning now to FIG. 5, a top view of chassis bezel  110  and cover plate  140  is illustrated in accordance with a preferred embodiment of the present invention. Biasing member  146  and biasing member  501  (not shown in other figures) are depicted extended away from planer members  142  and  143  respectively. As shown, cover plate  140  has been inserted into chassis bezel  110  sufficiently to allow biasing members  146  and  501  to extend such that if removal of cover plate  140  is attempted, biasing members  146  and  502  (as well as other tabs not shown in this view) will catch on interior pieces  502  and  503  of chassis bezel  110 . 
     Alternatively, the biasing members  146 ,  147 , and  501  on cover plate  140  may be replaced with fixed slotted tabs and the interior pieces  502  and  503  of chassis bezel  110  may be replaced with spring back tabs. In this case, when cover plate  140  is inserted into chassis bezel  110  the spring back tabs within chassis bezel  110  will squeeze together to allow insertion of cover plate  140 . Once cover plate  140  has been inserted sufficiently to allow the fixed slotted tabs of the cover plate to pass by the spring back tabs within chassis bezel  110 , the spring back tabs will extend back out, thus engaging the fixed slotted tabs on cover plate  140  preventing removal of the cover plate. In this embodiment, when removal of the cover plate is desired, access to the spring back tabs within chassis bezel  110  must be acquired and the spring back tabs within chassis bezel  110  squeezed together as cover plate  140  is gently removed. Access to the spring back tabs within chassis bezel  110  may be acquired in a similar fashion as described above. 
     In an alternative embodiment, the cover plate may be secured to the chassis bezel using security screws rather than biasing members. 
     Other tamper proof mechanisms may also be used to secure the cover plate to the chassis bezel thus preventing unauthorized removal of the flash memory card. It should also be noted that the cover plate may be constructed from the same or from different materials as athe chassis bezel. 
     Although the present invention has been described aprimarily with reference to flash memory cards, it should be noted that the present invention may be applied to other types of removable electronic devices as well such as, for example, PCMCIAs or cartridges for video games. 
     The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention, the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.