PCMCIA card heat removal apparatus and methods

• US 5,793,609 A
• Filed: 07/22/1996
• Issued: 08/11/1998
• Est. Priority Date: 07/22/1996
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Donahoe, Daniel N., Mecredy, Henry E. III
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US08/681,061
• Time in Patent Office: 750 Days
• Field of Search: 454/184, 165/80.3, 165/122, 165/126, 165/185, 361/687, 361/690, 361/694-697, 361/702-704, 361/717-720
• US Class Current: 361/695
• CPC Class Codes: G06F 1/20 Cooling means
• CPC Class Codes: G06F 1/203 for portable computers, e.g. for laptops
• CPC Class Codes: G06F 2200/201 Cooling arrangements using cooling fluid

Abstract

Operating heat generated by a PCMCIA card inserted into the base housing portion of a computer, representatively a notebook computer, is dissipated by a heat sink system disposed within the base housing. In response to insertion of the card into its associated support structure within the base housing, a metal heat sink plate member is resiliently pressed into firm engagement with a side of the inserted card by a spring member interconnected between the plate member and the card support structure. Card operating heat is efficiently transferred to the metal plate member by conduction. To dissipate the heat received by the plate member, a heat removing fluid is flowed against the plate member and caused to receive heat therefrom. Heat received by the fluid is then transferred to ambient air external to the computer to substantially lower the operating temperature of the inserted PCMCIA card. In one embodiment of the heat sink system the fluid is air flowed externally across the plate member, by a small fan disposed within the base housing, and then discharged outwardly through the base housing. In another embodiment of the heat sink system the fluid is a liquid sequentially pumped through a flow passage within the plate member, flowed through a radiator structure externally mounted on the computer, and then returned to the internal plate member flow passage.

Claims

1. Apparatus comprising:

a housing having an interior portion into which a printed circuit board may be inserted in an insertion direction;

support means for removably supporting a printed circuit board inserted into said interior portion of said housing; and

heat removal means for removing operating heat generated by the inserted printed circuit board, said heat removal means including;

a thermally conductive heat sink structure disposed within said housing and positionable against the inserted printed circuit board,

spring means for resiliently supporting said heat sink structure for movement relative to said housing in a second direction transverse to said insertion direction, and

cooling means for flowing a fluid against said heat sink structure and transferring heat from the heat sink structure to the fluid.

2. The apparatus of claim 1 wherein said spring means include:

an elongated leaf spring member having a first end supported in a fixed relationship relative to said housing, and a second end secured to said heat sink structure.

3. The apparatus of claim 2 wherein:

said heat sink structure has a tapered end portion and, with the printed circuit board removed from said housing, is held in a first position by said leaf spring member in a generally unflexed state thereof, said tapered end portion being positioned to be engaged and deflected by a leading end portion of the printed circuit board during insertion of the printed circuit board into the interior of said housing, to a second position that resiliently deflects said leaf spring member in a manner causing it to resiliently and operatively hold said plate member against the inserted printed circuit board.

4. The apparatus of claim 1 wherein said cooling means include:

fan means, disposed within said housing, for flowing air against said heat sink structure and then discharging the air from said housing.

5. The apparatus of claim 4 wherein:

said heat sink structure includes a heat sink plate member having a first side positionable against a major central side portion of the inserted printed circuit board.

6. The apparatus of claim 5 wherein:

said heat sink plate member has a second side from which a spaced plurality of cooling fin structures outwardly project, and said heat sink structure further includes a shroud member extending over said cooling fin structures and forming with said second side of said heat sink plate member an open-ended passage through which cooling air may be flowed, and

said fan means are operative to flow air through said open-ended passage.

7. The apparatus of claim 1 wherein:

said heat sink structure includes a plate member having a first side positionable against a major central side portion of the inserted printed circuit board by said spring member and a flow passage extending internally through said plate member and having an inlet and an outlet, and

said cooling means are operative to flow a liquid through said flow passage.

8. The apparatus of claim 7 wherein said cooling means include:

a pump disposed within said housing,

a radiator, and

conduit means communicating said inlet and outlet of said flow passage through said pump and radiator.

9. The apparatus of claim 1 wherein;

said housing is a portable computer housing.

10. The apparatus of claim 9 wherein:

said portable computer housing is a notebook computer housing.

11. Apparatus comprising:

a housing having an interior portion into which a printed circuit board may be inserted;

support means for removably supporting a printed circuit board inserted into said interior portion of said housing;

a heat sink structure disposed within said housing;

first means, responsive to the insertion of the printed circuit board into said housing, for causing said heat sink structure to forcibly engage the inserted printed circuit board to receive operating heat therefrom,

said first means including a spring member resiliently supporting said heat sink structure adjacent said interior portion of said housing for movement relative to said housing; and

second means for flowing a fluid against said heat sink structure to receive heat therefrom.

12. The apparatus of claim 11 wherein said housing has an opening therein through which the printed circuit board may be inserted, said opening being sized to receive a PCMCIA card.

13. The apparatus of claim 11 wherein said spring member is operative to resiliently press said heat sink structure against a major central side portion of the inserted printed circuit board.

14. The apparatus of claim 11 wherein said housing is a computer housing.

15. The apparatus of claim 14 wherein said computer housing is a portable computer housing.

16. The apparatus of claim 15 wherein said portable computer housing is a notebook computer housing.