Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-02-12
2001-03-27
Picard, Leo P. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S796000, C361S727000
Reexamination Certificate
active
06208522
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a computer chassis, and more particularly, but not by way of limitation, to a computer chassis constructed to receive multiple modular components and further with a single center pluggable midplane board for cable-less connection of the modular components.
BACKGROUND OF THE INVENTION
Early computer designs generally included a chassis with a plurality of individual components and assemblies mounted therein and connected to one another by means of wires, cables, brackets, nuts, bolts and the like. A major computer design advance occurred with the advent of printed circuit boards, integrated circuits and modular component assemblies. The printed circuit boards were, for example, formed of lightweight material and housed a myriad of components which were electrically interconnected with the component assemblies through wiring harnesses. The wiring harnesses and hard wire connections were subsequently replaced by technologically advanced connectors used for integrally coupling the individual components to each other and to other circuitry in the computer.
In the design of electronic equipment, the use of connectors, modular components, and specialized hardware has permitted key components and printed circuit boards to be efficiently added and removed. Such ease in the addition and deletion of computer components and printed circuit boards has facilitated assembly, repair, upgrade and/or changes in functionality.
Computer reliability and serviceability are also valuable design aspects. Originally, a rule of practice in the maintenance of electrical circuitry, such as computer hardware, was that of always turning the power to the computer off before components or printed circuit boards were added or removed from the computer chassis or support frame. Recent innovations have addressed the desirability to insert and remove modular components and printed cards from electrical equipment, such as computer hardware, when the computer is electrically connected and operational, i.e. “hot.” It is now possible for the power to be disconnected from only the connector of the drive or modular component to be removed or inserted while allowing the adjacent components to remain “hot.”
Removable computer components today include disc drives, drive cages, fans, power supplies, system I/O modules, processor boards, and other subassemblies. As referenced above, the removability of computer components allows for better overall serviceability of the computer system, which is a distinct advantage to both the user and the maintenance technician. A defective power supply in the main or central computer generally requires prompt replacement in order to limit downtime. It is for this reason that modular components and connectors facilitate prompt replacement and are thus popular in many computer designs.
The modularity of computer systems is thus recognized as an important design consideration. As mentioned above, modules can be removed and examined for operability or other purposes much easier than permanently mounted fixtures within a computer chassis. Because computers provide an integral part of most business operations, it is of utmost importance to maintain the reliability and integrity of the computer system. When the various elements of a computer can be easily removed in a modular form, they can also be replaced to maintain the operational status of the computer.
Many existing design approaches for these types of computer chassis configured to receive modular computer components utilizes ribbon cables to connect interconnect the various modules. This requires the computer chassis to be large enough for a user to be able to reach into the chassis, behind the modules to be able to connect and disconnect the modules. This therefore, requires a larger form factor, thereby taking up valuable rack space.
Therefore, as can be appreciated there is a need for a computer chassis configured to receive modular computer components that can be readily serviced and upgraded, and that also has a minimum form factor.
SUMMARY OF THE INVENTION
The present invention overcomes the above identified problems as well as other shortcomings and deficiencies of existing technologies by providing a computer chassis configured to receive modular components that can be readily serviced and upgraded, and that also has a minimum form factor.
The present invention further provides a modularized computer chassis for housing multiple computer modules, such as a processor module, media storage module, an I/O module, and power supplies. The chassis includes a housing divided generally into four regions, with each region configured for receiving one of the modules or power supplies. A single center pluggable midplane board is positioned in the middle of the housing such that each of the modules and power supplies can be interconnected through the single midplane board. The single center pluggable midplane board includes direct pluggable connectors which correspond to connectors on each of the modules and power supplies, such that each of the modules and power supplies are directly connected to the single pluggable midplane board, and such that no ribbon signal and power cables are needed for the connection. The direct connection between the single center pluggable midplane board and the modules and power supplies helps to minimize the height of the chassis, thereby saving valuable rack space.
REFERENCES:
patent: 5027254 (1991-06-01), Corfits et al.
patent: 5031070 (1991-07-01), Hsu
patent: 5297000 (1994-03-01), Freige et al.
patent: 5808876 (1998-09-01), Mullenbach et al.
Hardt Thomas T.
Manweiler Kurt A.
Sanders Michael C.
Compaq Computer Corp.
Duong Hung Van
Picard Leo P.
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