Wireless device enclosure using piezoelectric cooling structures

• US 7,248,475 B2
• Filed: 05/31/2005
• Issued: 07/24/2007
• Est. Priority Date: 05/31/2005
• Status: Expired due to Fees

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Intel Corporation
• Inventors: Paydar, Reza, Sauciuc, Ioan
• Primary Examiner(s): DATSKOVSKIY, MICHAIL V
• Application Number:
  US11/140,769
• Publication Number:
  US 20060268534A1
• Time in Patent Office: 784 Days
• Field of Search: 361/678, 361/679, 361690-697, 361/687, 361/699, 165/80.3, 165/122, 165/104.33, 165/104.34, 454184-186, 257712-727, 312/236, 312/223.1, 312/223.2, 312/223.3, 310311-371, 417/410.1, 417/436
• US Class Current: 361/695
• CPC Class Codes: F04D 29/582 specially adapted for elastic fluid pumps
• CPC Class Codes: F04D 33/00 Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type F04D35/00 takes precedence; hand-held fans A45B
• CPC Class Codes: H01L 2224/0401 Bonding areas specifically adapted for bump connectors, e.g. under bump metallisation [UBM]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 23/467 by flowing gases, e.g. air H01L23/473 takes precedence
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

An enclosure for a wireless device includes a first compartment and a second compartment. The first compartment is to house some or all of the electronic circuitry of the wireless device and is sealed from an exterior environment. The second compartment is adjacent to the first compartment and includes one or more piezoelectric fans to provide cooling for the first compartment. The second compartment is open to the exterior environment and provides physical protection for the one or more piezoelectric fans located therein.

Claims

1. A wireless device comprising:

a first sealed compartment having electronic circuitry disposed therein, said first sealed compartment having a first wall; and

a second compartment, on an opposite side of said first wall from said first sealed compartment, that includes at least one piezoelectric fan to provide cooling for said first sealed compartment, said second compartment having at least one opening to allow air flow between said second compartment and an exterior environment, wherein said second compartment provides protection from physical damage for said at least one piezoelectric fan.

2. The wireless device of claim 1, wherein:

said at least one piezoelectric fan wiihin said second compartment includes one or more piezoelectric fans that are mounted on said first wall.

3. The wireless device of claim 1, wherein:

said second compartment has an internal dimension in a direction perpendicular to said first wall that is no greater than 15 millimeters.

4. The wireless device of claim 1, wherein:

said second compartment includes a second wall that is on an opposite side of said second compartment from said first wall, wherein said at least one opening includes one or more openings within said second wall.

5. The wireless device of claim 1, wherein:

said first sealed compartment includes at least one piezoelectric fan to produce air movement within said first sealed compartment.

6. The wireless device of claim 5, wherein:

said at least one piezoelectric fan within said first sealed compartment includes one or more piezoelectric fans that are mounted on said first wall.

7. The wireless device of claim 6, wherein:

said one or more piezoelectric fans within said first sealed compartment that are mounted on said first wall includes a first piezoelectric fan that is mounted in a location that is proximate to a digital processing device within said first sealed compartment.

8. The wireless device of claim 1, further comprising:

a battery; and

a DC-to-AC converter, coupled to said battery, to convert a DC voltage output by said battery to an AC signal to be applied to said at least one piezoelectric fan.

9. The wireless device of claim 8, wherein:

said AC signal to be applied to said at least one piezoelectric fan has a frequency that is no greater than 150 Hertz.

10. An enclosure for a wireless device, comprising:

a first compartment to house electronic circuitry in a region sealed from an exterior environment, said electronic circuitry to be used to support wireless communication, said first compartment including a first wall; and

a second compartment, on an opposite side of said first wall from said first compartment, that includes at least one piezoelectric fan to provide cooling for said first compartment, said second compartment having at least one opening to allow air flow between said second compartment and said exterior environment, wherein said second compartment provides protection from physical damage for said at least one piezoelectric fan.

11. The enclosure of claim 10, wherein:

said at least one piezoelectric fan within said second compartment includes one or more piezoelectric fans that are mounted on said first wall.

12. The enclosure of claim 10, wherein:

said second compartment has an internal dimension in a direction perpendicular to said first wall that is no greater than 15 millimeters.

13. The enclosure of claim 10, wherein:

said second compartment includes a second wall that is on an opposite side of said second compartment from said first wall, wherein said at least one opening includes one or more openings within said second wall.

14. The enclosure of claim 10, wherein:

said first compartment includes at least one piezoelectric fan to produce air movement within said first compartment.

15. The enclosure of claim 14, wherein:

said at least one piezoelectric fan within said first compartment includes one or more piezoelectric fans that are mounted on said first wall.

16. A method comprising:

using a wireless device to communicate with a remote wireless entity, said wireless device including electronic circuitry within a first sealed compartment thereof; and

activating at least one piezoelectric fan within a second compartment of said wireless device to cool said first sealed compartment of said wireless device, said second compartment having at least one opening to provide air flow between said second compartment and an exterior environment.

17. The method of claim 16, wherein:

activating at least one piezoelectric fan includes generating an alternating current (AC) signal and delivering said AC signal to said at least one piezoelectric fan.

18. The method of claim 16, wherein:

delivering said AC signal to said at least one piezoelectric fan includes feeding said AC signal into said second compartment from said first compartment.

19. The method of claim 16, further comprising:

activating at least one piezoelectric fan within said first sealed compartment of said wireless device to produce air movement within said first sealed compartment, said air movement to cool at least one electronic component within said first sealed compartment by forced convection.