CA2149603A1 - Electronic unit - Google Patents

Electronic unit

Info

Publication number
CA2149603A1
CA2149603A1 CA002149603A CA2149603A CA2149603A1 CA 2149603 A1 CA2149603 A1 CA 2149603A1 CA 002149603 A CA002149603 A CA 002149603A CA 2149603 A CA2149603 A CA 2149603A CA 2149603 A1 CA2149603 A1 CA 2149603A1
Authority
CA
Canada
Prior art keywords
heat
board
heat sink
increases
heat conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002149603A
Other languages
French (fr)
Other versions
CA2149603C (en
Inventor
Adrianus P. Van Gaal
Richard J. Humphreys
John C. Atkinson
Amit Chawla
Yee-Ning Chan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to CA002149603A priority Critical patent/CA2149603C/en
Publication of CA2149603A1 publication Critical patent/CA2149603A1/en
Application granted granted Critical
Publication of CA2149603C publication Critical patent/CA2149603C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

Electronic unit in which a printed circuit board is located within a housing which includes a heat sink.
The board is normally urged out of heat conductive relationship with the heat sink. As temperature increases the circuit board and heat sink are caused to move relatively so as to bring the board into heat conductive relationship with the heat sink so as to remove heat from the board. As temperature decreases the board and heat sink are again moved out of heat conductive relationship.
Preferably a heat conduction element is provided to conduct heat from the board. This comprises at least one compressible member, e.g. compressible cellular material, which is progressively compressed as temperature increases.
Preferably the heat conductive efficiency of the compressible member increases as compression increases.
CA002149603A 1995-05-17 1995-05-17 Electronic unit Expired - Fee Related CA2149603C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002149603A CA2149603C (en) 1995-05-17 1995-05-17 Electronic unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002149603A CA2149603C (en) 1995-05-17 1995-05-17 Electronic unit

Publications (2)

Publication Number Publication Date
CA2149603A1 true CA2149603A1 (en) 1996-11-18
CA2149603C CA2149603C (en) 2003-11-11

Family

ID=4155865

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002149603A Expired - Fee Related CA2149603C (en) 1995-05-17 1995-05-17 Electronic unit

Country Status (1)

Country Link
CA (1) CA2149603C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6376779B1 (en) 2000-08-24 2002-04-23 Nortel Networks Limited Printed circuit board having a plurality of spaced apart scrap border support tabs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6376779B1 (en) 2000-08-24 2002-04-23 Nortel Networks Limited Printed circuit board having a plurality of spaced apart scrap border support tabs

Also Published As

Publication number Publication date
CA2149603C (en) 2003-11-11

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed