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A notebook computer base housing has operatively disposed therein a CD ROM drive, a hard disk drive and a floppy disk drive, an AC/DC electrical power converter, a modem, a PCMCIA card bay structure and a battery. This internal provision of three drive units in addition to the other equipment within

A notebook computer base housing has operatively disposed therein a CD ROM drive, a hard disk drive and a floppy disk drive, an AC/DC electrical power converter, a modem, a PCMCIA card bay structure and a battery. This internal provision of three drive units in addition to the other equipment within the base housing is facilitated from a space standpoint by the vertical stacking of the hard disk drive atop the CD ROM drive within the base housing. To dissipate the operating heat from these components within the base housing, a heat spreader plate is interposed between the CD ROM drive and the overlying hard disk drive, and the high heat-generating components--namely, the modem, the AC/DC converter, the PCMCIA card bay structure, and the computer processor--are closely grouped together, with the AC/DC converter in thermal communication with a second heat spreader plate. The processor is disposed above the other high heat-generating components on a horizontally oriented main system circuit board, with the circuit board having top and bottom side heat sink members thermally communicated with the processor. An axial fan disposed in the base housing creates an upper flow of cooling air that passes over the upper heat sink member, and a lower flow of cooling air that passes over the lower heat sink member and the heat-generating components grouped below the processor.

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[ What is claimed is:] [1.] A portable computer comprising:a base housing having first and second adjacent exterior wall portions with first and second air flow openings respectively extending therethrough;a display screen housing secured to said base housing for movement relative thereto between op

[ What is claimed is:] [1.] A portable computer comprising:a base housing having first and second adjacent exterior wall portions with first and second air flow openings respectively extending therethrough;a display screen housing secured to said base housing for movement relative thereto between open and closed positions;a first drive unit;a second drive unit;a third drive unit;an AC/DC electrical power converter structure;a circuit board;a processor mounted on said circuit board;mounting structure operatively mounting said first second and third drive units, said AC/DC electrical power converter structure and said circuit board within said base housing, with said processor and said AC/DC electrical power converter structure being adjacent one another and said first and second adjacent exterior wall portions within the interior of said base housing,said AC/DC electrical power converter structure, said circuit board, said processor, and said first and second adjacent exterior wall portions partially bounding a substantially walled-off plenum area extending inwardly from said first and second air flow openings through only a relatively small interior portion of said base housing; anda cooling system operative to create a localized flow of cooling air which sequentially (1) flows into said plenum area through said first air flow opening, (2) flows through said plenum area in a manner contacting and cooling each of said AC/DC electrical power converter structure and said processor, and (3) flows outwardly from said plenum area through said second air flow opening.