Heat sink/component access door for portable computers

• US 5,424,913 A
• Filed: 01/11/1994
• Issued: 06/13/1995
• Est. Priority Date: 01/11/1994
• Status: Expired due to Term

• Current Assignee: Dell USA LP (Dell Technologies Inc.)
• Original Assignee: Dell USA LP (Dell Technologies Inc.)
• Inventors: Swindler, Dan
• Primary Examiner(s): Thompson, Gregory D.
• Application Number:
  US08/179,807
• Time in Patent Office: 518 Days
• Field of Search: 361/683, 361/686-693, 361/704, 361/707-711, 361/715-722, 361/724
• US Class Current: 361/679.54
• CPC Class Codes: G06F 1/203 for portable computers, e.g. for laptops

Abstract

Disclosed is an access door for computer systems comprising an outer case containing an electronic component of the computer system that is capable of generating heat during the operation of the computer system. The outer case has an aperture in its surface proximate the component to allow external access into the outer case. The access door is capable of assuming a closed position where it closes the aperture, covers the component and forms a part of the outer. The access door is also capable of being placed in an open position wherein the component is externally exposed through the aperture. The access door includes a heat sink having a heat receiving portion positioned to mechanically contact a surface of the component to allow transmission of heat from the component to the heat receiving portion. The heat sink further includes a heat dissipating portion forming an outer surface of the access door that is capable of dissipating heat received from the component via the heat receiving portion into an environment surrounding the computer system. The door thereby cools the component when in the closed position and allows access to the component when in the open position.

Claims

1. A computer system, comprising:

an outer case containing an electronic component of said computer system, said component capable of generating heat during operation thereof, said outer case having an aperture in a surface thereof proximate said component to allow external access thereto; and

an access door capable of assuming a closed position wherein said access door closes said aperture, covers said component and forms a part of said outer case and an open position wherein said component is externally exposed through said aperture, said access door including a heat sink having a heat receiving portion positioned to mechanically contact a surface of said component to allow transmission of heat from said component to said heat receiving portion, said heat sink further including a heat dissipating portion forming an outer surface of said access door and capable of dissipating heat received from said component via said heat receiving portion into an environment surrounding said computer system.

2. The computer as recited in claim 1 wherein said heat receiving portion comprises a substantially flat surface conforming and corresponding to said surface of said component.

3. The computer as recited in claim 1 wherein said heat dissipating portion comprises a plurality of externally projecting fins, said fins presenting a substantial heat-radiating surface to dissipate said heat into the environment.

4. The computer as recited in claim 1 further comprising means secured to said surface of said outer case for retaining said access door in said closed position.

5. The computer as recited in claim 1 wherein said heat receiving portion comprises a compliant, thermally transmissible material secured thereto between said heat receiving portion and said surface of said component.

6. The computer as recited in claim 1 further comprising means, located within said access door, for resiliently biasing said heat receiving portion against said surface of said component.

7. The computer as recited in claim 1 wherein said surface of said outer case is a bottom surface of said computer system.

8. A method of cooling and providing access to an electronic component within a computer system, comprising the steps of:

translating an access door from an initial, open position wherein an aperture in a surface of an outer case of said computer system proximate said component exposes said component for external access thereto to a subsequent, closed position wherein said access door closes said aperture, covers said component and forms a part of said outer case;

resiliently biasing a heat receiving portion of a heat sink within said access door against a surface of said component to allow transmission of heat from said component to said heat receiving portion; and

transmitting said heat from said heat receiving portion to a heat dissipating portion of said heat sink forming an outer surface of said access door and capable of dissipating heat received from said component via said heat receiving portion into an environment surrounding said computer system, said access door thereby cooling said component when in said closed position and allowing access to said component when in said open position.

9. The method as recited in claim 8 wherein said heat receiving portion comprises a substantially flat surface conforming and corresponding to said surface of said component.

10. The method as recited in claim 8 wherein said heat dissipating portion comprises a plurality of externally projecting fins, said fins presenting a substantial heat-radiating surface to dissipate said heat into said environment.

11. The method as recited in claim 8 further comprising the step of retaining said access door in said closed position.

12. The method as recited in claim 8 wherein said heat receiving portion further comprises a compliant thermally transmissible material secured thereto between said heat receiving portion and said surface of said component and the method further comprises the step of receiving said heat from said surface of said component through said compliant, thermally transmissible material.

13. The method as recited in claim 8 wherein said surface of said outer case is a bottom surface of said computer system.

14. A portable computer, comprising:

an outer case containing a central processing unit (CPU) of said portable computer, said CPU capable of generating heat during operation thereof, said outer case having an aperture in a surface thereof proximate said CPU to allow external access thereto; and

an access door capable of assuming a closed position wherein said access door closes said aperture, covers said CPU and forms a part of said outer case and an open position wherein said CPU is externally exposed through said aperture, said access door including a heat sink extending through said access door, said heat sink having a substantially flat surface adapted to mechanically contact a corresponding substantially flat surface of said CPU to allow transmission of heat from said CPU to said substantially flat surface of said heat sink, said heat sink further including a plurality of heat dissipating fins forming an outer surface of said access door and capable of dissipating heat received from said CPU via said substantially flat surface of said heat sink into an environment surrounding said portable computer.

15. The computer as recited in claim 14 wherein said fins present a substantial heat-radiating surface to dissipate said heat into the environment.

16. The computer as recited in claim 14 further comprising means, secured to said surface of said outer case, for retaining said access door in said closed position.

17. The computer as recited in claim 14 wherein said substantially flat surface further comprises a compliant, thermally transmissible material secured to said substantially flat surface between said substantially flat surface of said heat sink and said surface of said CPU.

18. The computer as recited in claim 14 further comprising a plurality of springs located within said access door and capable of resiliently biasing said heat sink against said surface of said CPU.

19. The computer as recited in claim 14 wherein said surface of said outer case is a bottom surface of said portable computer.

20. A method of cooling and providing access to a central processing unit (CPU) within a portable computer, comprising the steps of:

translating an access door from an initial, open position wherein an aperture in a surface of an outer case of said portable computer proximate said CPU exposes said CPU for external access thereto to a subsequent, closed position wherein said access door closes said aperture, covers said CPU and forms a part of said outer case;

resiliently biasing, with a plurality of springs, a substantially flat surface of a heat sink secured to and extending through said access door against a corresponding, substantially flat surface of said CPU to allow transmission of heat from said CPU to said substantially flat surface of said heat sink; and

transmitting said heat from said substantially flat surface of said heat sink to a plurality of heat dissipating fins forming an outer surface of said access door and capable of dissipating heat received from said CPU via said substantially flat surface of said heat sink into an environment surrounding said portable computer.

21. The method as recited in claim 20 wherein said fins present a substantial heat-radiating surface to dissipate said heat into the environment.

22. The method as recited in claim 20 further comprising the step of retaining said access door in said closed position.

23. The method as recited in claim 20 wherein said substantially flat surface further comprises a compliant, thermally transmissible material secured thereto and said method further comprises the step of receiving said heat from said surface of said CPU through said compliant, thermally transmissible material.

24. The method as recited in claim 20 wherein said surface of said outer case is a bottom surface of said portable computer.

25. A notebook personal computer, comprising:

an outer case containing a microprocessor of said computer, said microprocessor capable of generating heat during operation thereof, said outer case having an aperture in a surface thereof proximate said microprocessor to allow external access thereto;

an access door capable of assuming a closed position wherein said access door closes said aperture, covers said microprocessor and forms a part of said outer case and an open position wherein said microprocessor is externally exposed through said aperture, said access door including a metal heat sink extending through said access door, said heat sink having a substantially flat surface adapted to mechanically contact a corresponding substantially flat surface of said microprocessor to allow transmission of heat from said microprocessor to said substantially flat surface of said heat sink, said heat sink further including a plurality of heat dissipating fins forming an outer surface of said access door and capable of dissipating heat received from said microprocessor via said substantially flat surface of said heat sink into an environment surrounding said computer;

a latch coupled to said access door and capable of retaining said access door in said closed position; and

a plurality of springs located within said access door and capable of resiliently biasing said heat sink against said surface of said microprocessor.

26. The computer as recited in claim 25 wherein said substantially flat surface further comprises a compliant, thermally transmissible material secured to said substantially flat surface between said substantially flat surface of said heat sink and said surface of said microprocessor.

27. The computer as recited in claim 25 wherein said surface of said outer case is a bottom surface of said computer.

28. A method of cooling and providing access to a microprocessor within a notebook personal computer, comprising the steps of:

translating an access door from an initial, open position wherein an aperture in a surface of an outer case of said computer proximate said microprocessor exposes said microprocessor for external access thereto to a subsequent, closed position wherein said access door closes said aperture, covers said microprocessor and forms a part of said outer case;

resiliently biasing, with a plurality of springs, a substantially flat surface of a metal heat sink secured to and extending through said access door against a corresponding, substantially flat surface of said microprocessor to allow transmission of heat from said microprocessor to said substantially flat surface of said heat sink;

transmitting said heat from said substantially flat surface of said heat sink to a plurality of heat dissipating fins forming an outer surface of said access door and capable of dissipating heat received from said microprocessor via said substantially flat surface of said heat sink into an environment surrounding said computer; and

latching said access door in said closed position.

29. The method as recited in claim 28 wherein said fins presenting a substantial heat-radiating surface to dissipate said heat into said environment.

30. The method as recited in claim 28 wherein said substantially flat surface further comprises a compliant, thermally transmissible material secured thereto and the method further comprises the step of receiving said heat from said surface of said microprocessor through said compliant, thermally transmissible material.

31. The method as recited in claim 28 wherein said surface of said outer case is a bottom surface of said computer.