WO2000011757A1 - A retention mechanism for an electrical assembly - Google Patents
A retention mechanism for an electrical assembly Download PDFInfo
- Publication number
- WO2000011757A1 WO2000011757A1 PCT/US1999/018693 US9918693W WO0011757A1 WO 2000011757 A1 WO2000011757 A1 WO 2000011757A1 US 9918693 W US9918693 W US 9918693W WO 0011757 A1 WO0011757 A1 WO 0011757A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat sink
- substrate
- slot
- assembly
- circuit board
- Prior art date
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
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1401—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means
- H05K7/1402—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means for securing or extracting printed circuit boards
- H05K7/1405—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means for securing or extracting printed circuit boards by clips or resilient members, e.g. hooks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/40—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs
- H01L23/4093—Snap-on arrangements, e.g. clips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/7005—Guiding, mounting, polarizing or locking means; Extractors
- H01R12/7011—Locking or fixing a connector to a PCB
- H01R12/7047—Locking or fixing a connector to a PCB with a fastener through a screw hole in the coupling device
Definitions
- the present invention relates to a retention mechanism for securing an electronic assembly to a motherboard that has studs provided.
- FIG 1 shows a product marketed by Intel Corporation, the assignee of this application, which is referred to as a single edge contact cartridge (SECC) .
- the Intel SECC includes a microprocessor which is assembled into a package 1 that is mounted to a substrate 2.
- the SECC may also have other integrated circuit packages 3 which contain static random access memory (SRAM) integrated circuits.
- SRAM static random access memory
- One edge of the substrate 2 has a plurality of conductive pads 4 which can be inserted into an electrical connector 5.
- the electrical connector 5 can be mounted to a printed circuit board 6 such as the motherboard of a computer.
- the pads 4 and connector 5 electrically couple the substrate 2 to the circuit board 6.
- the substrate 2 and integrated circuit packages 1 and 3 are enclosed by a cover 7 and a thermal plate 8.
- the cover 7 , plate 8 and substrate 2 provide an electronic cartridge which can be plugged into a computer motherboard 6.
- the electrical system shown in Fig. 1 can sustain to external shock and vibration loads. Such loads may produce intermittent separation between the pads 4 and the connector 5. Intermittent separation between the pads 4 and connector 5 may create electrical "opens.”
- the system is provided with a retention mechanism 9 to secure the substrate 2 to the connector 5 and prevent contact separation under shock and vibration loads .
- the retention mechanism 9 includes a pair of posts 10 that are mounted to the circuit board 6. Each post 10 includes an aperture 11 which receives a latch 12 that extends from the cover 7 of the cartridge. When inserted into the aperture 11 each latch 12 prevents the substrate 2 from being pulled out of the connector 5. The substrate 2 can be unplugged from the connector 5 by pressing a pair of latch levers 13 and pulling the cartridge away from the board 6. Pressing the levers 13 moves the latches 12 out of the apertures 11 of the posts 10.
- the integrated circuits generate heat which must be removed from the circuits.
- the thermal plate 8 is thermally coupled to the integrated circuit package 1 of the SECC to provide a thermal path for the heat generated by the microprocessor.
- a heat sink 14 may be mounted to the thermal plate 8 to further facilitate the removal of the heat.
- the heat sink 14 is typically constructed from a thermally conductive material such as aluminum or copper. Metal heat sinks 14 have a weight which increases the magnitude of loads on the cartridge, particularly when the system is subjected to shock or vibration.
- the Intel SECC includes a heat sink support assembly 15 that is mounted to the printed circuit board 6 and supports the heat sink 14.
- the support assembly 15 includes a support bar 16 that is inserted into holes of the circuit board 6.
- the assembly 15 also includes a tie bar 17 that is inserted into a groove 18 of the heat sink 14 and snapped onto posts 19 of the support bar 16.
- One embodiment of the present invention is a retention mechanism for an electronic assembly which has a substrate and a heat sink.
- the assembly includes a heat sink slot that receives the heat sink, and a substrate slot that receives the substrate.
- Figure 1 is a perspective view of an electrical assembly of the prior art
- Figure 2 is a perspective view of an embodiment of an electrical assembly of the present invention
- Figure 3 is a rear view showing a clip that attaches a heat sink to a substrate
- Figure 4 is an end view showing a substrate being inserted into a retention mechanism
- Figure 5 is a side sectional view of a substrate and a heat sink inserted into a retention mechanism
- Figure 6 is a perspective view of an alternate embodiment of the retention mechanism.
- One embodiment of the present invention is a retention mechanism for an electronic assembly which has a substrate and a heat sink.
- the retention mechanism includes a first slot that receives the heat sink and a second slot that receives the substrate.
- the heat sink guides the substrate into the connector.
- the symmetric slots eliminate the need for a left side mechanism and a right side mechanism. Providing a single mechanism reduces the complexity and cost of mass producing an electrical assembly which contains the substrate, heat sink and mechanism. Supporting both the substrate and the heat sink with a single mechanism also eliminates the need to provide a separate support assembly for the heat sink.
- the retainer mechanism may also have a nut retainer that captures a nut that is used to attach the mechanism to the printed circuit board with studs.
- the nut retainer allows the nut to be transported with the retainer mechanism during an assembly process.
- Figure 2 shows an embodiment of an electrical assembly 30 of the present invention.
- the assembly 30 includes an electronic assembly 32 that can be plugged into an electrical connector 34.
- the connector 34 may be mounted to a printed circuit board 36.
- the printed circuit board 36 may be a motherboard of a computer.
- the electronic assembly 32 may include an integrated circuit package 38 that is mounted to a substrate 40.
- the integrated circuit package 38 may contain an integrated circuit (not shown) such as a microprocessor.
- the substrate 40 may be a printed circuit board. One edge of the substrate 40 may have a plurality of contacts 42 that can be inserted into the electrical connector 34.
- the substrate 40 may have routing traces, power/ground planes, vias, surface pads, etc. which electrically connect the integrated circuit package 38 to the contacts 42.
- the electronic assembly 32 may further have a heat sink 44 that is mounted to the substrate 40.
- the heat sink 44 may be pressed against the integrated circuit package 38 to provide a thermal path for the heat generated by the integrated circuit.
- the assembly 32 may include a clip 46 which attaches the heat sink 44 to the substrate 40.
- the clip 46 may have a plurality of L-shaped ears 48 that are inserted through clearance holes 50 in the substrate 40 and corresponding attachment holes 51 in the heat sink 44.
- the clip 46 may have four ears 48 which extend from a center plate portion 52.
- the L-shaped ears 48 are bent during insertion through the holes 50 and 52.
- There may be provided a tool (not shown) which bends the ears 48 during the insertion step.
- the clip 46 may be constructed from a steel material which does not yield during the assembly process .
- the center plate portion 52 may have a pair of handles 53 that allow an operator to more easily grasp the clip 46 during installation.
- the L-shaped ears 48 snap back after clearing the attachment holes 51 of the heat sink 44.
- the clip 46 may exert a spring force that pushes the heat sink 44 into the integrated circuit package 38.
- the assembly 30 may include a pair of retention mechanisms 54 that are mounted to the printed circuit board 36.
- the retention mechanisms 54 retain and support the electronic assembly 32.
- Each retention mechanism 54 may have a back wall 56 that extends from the printed circuit board 36.
- the mechanism 54 may include a plurality of first walls 58 which extend from the backwall 56 and are separated from each other by a pair of heat sink slots 60.
- the walls 58 are adjoined by a base portion 62.
- a pedestal 64 portion of the heat sink 44 may be inserted into either heat sink slot 60. Insertion of the heat sink 44 into the heat sink slot 60 guides the substrate 40 into the connector 34.
- walls 58 may be separated from each other by a substrate slot 66.
- the substrate slot 66 may receive the substrate 40.
- each retention mechanism 54 may have a pair of studs 72 that are pressed into a pair of corresponding holes 74 in the printed circuit board 36 through clearance holes 75 in the mechanism 54.
- Pins 76 may be pressed into the retention studs 72 to expand the studs 72 and secure the retention mechanism 54 to the circuit board 36.
- the retention mechanism 54 may have a pair of latch apertures 78.
- one of the latch apertures 78 may receive a tab 80 of the heat sink 44.
- the tab 80 prevents the electronic assembly 32 from being pulled out of the connector 34.
- the retention mechanism 54 may have an inward angle of approximately 3.2* to apply a compressive force on the heat sink 44. The compressive force prevents the substrate 40 from moving relative to the connector 34. The compressive force has been found to be adequate to allow the retention mechanism to withstand 50 G's in all axes.
- an operator can depress a latch arm 82 to move the backwall 56 so that the tab 80 is separated from the retention mechanism 54.
- the operator can decouple tabs 80 that are located on both sides of the heat sink 44 from the latch apertures 78. Once the tabs 80 are decoupled from the retention mechanisms 54 the operator can pull the substrate 40 out of the connector 34.
- each slot 60 are preferably such that the walls 58 apply a spring force onto the sides of the heat sink 44.
- the slots 60 may be symmetrically located on the retention mechanism so that a mechanism can be installed on either the right side or left side of the connector 32. This design eliminates the need for a right hand part and a separate left hand part. Separate right hand and left hand parts would increase the complexity of the assembly process and the inventory required for the assembly 30.
- the walls and studs of the retention mechanisms may all be integrated into a single injection molded part. Additionally, the insertion of the heat sink 44 into the retention mechanism creates a "clicking" sound which provides an indication to the person installing the electronic assembly that the substrate 40 is connected to the circuit board.
- Figure 6 shows another embodiment of a retention mechanism 54 ' which has a pair of nut retainers 84 which extend from the backwall 56 adjacent to the clearance holes 75.
- the nut retainers 84 may each have a channel 86 that receives a nut 88.
- the nuts 88 can be screwed onto threaded studs 90 that extend up from the printed circuit board 36.
- the nuts 88 and studs 90 secure the retention mechanism 54' to the circuit board 36.
- Each nut retainer 84 may have a pair of arms 92 which extend about the channel 86 in a circular pattern.
- the arms 92 are flexible enough so that the nuts 88 can be snapped into the channels 86.
- the distance between the ends of the arms 92 is less than the diameter of the nuts 88 so that the nuts 88 are captured by the nut retainers 84.
- the nuts 88 may each have a flange 94 that extends into a groove 96 of a nut retainer 84.
- the flange 94 may have a thickness that is less than a height of the groove 96 to provide space for the nut to move up when initially placed on the stud 90. This allows the nut 88 to be tightened onto the stud 90 without cross threading.
- the nut retainers 84 allow a manufacturer of the retainer mechanism 54 ' to ship the mechanism 54' with the nuts 88.
- An assembler can install the retainer mechanism 54 ' by placing the mechanism 54 onto the -printed circuit board 36 so that the studs 90 extend through the holes 75.
- the nuts 88 can be rotated onto the studs 90 to attach the retainer mechanism 54 ' to the circuit board 36.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU56764/99A AU5676499A (en) | 1998-08-20 | 1999-08-17 | A retention mechanism for an electrical assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/137,520 US6585534B2 (en) | 1998-08-20 | 1998-08-20 | Retention mechanism for an electrical assembly |
US09/137,520 | 1998-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000011757A1 true WO2000011757A1 (en) | 2000-03-02 |
Family
ID=22477796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/018693 WO2000011757A1 (en) | 1998-08-20 | 1999-08-17 | A retention mechanism for an electrical assembly |
Country Status (4)
Country | Link |
---|---|
US (2) | US6585534B2 (en) |
AU (1) | AU5676499A (en) |
TW (1) | TW441228B (en) |
WO (1) | WO2000011757A1 (en) |
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1998
- 1998-08-20 US US09/137,520 patent/US6585534B2/en not_active Expired - Fee Related
-
1999
- 1999-08-17 AU AU56764/99A patent/AU5676499A/en not_active Abandoned
- 1999-08-17 WO PCT/US1999/018693 patent/WO2000011757A1/en active Application Filing
- 1999-08-20 TW TW088114265A patent/TW441228B/en not_active IP Right Cessation
-
2003
- 2003-01-02 US US10/335,679 patent/US6722908B2/en not_active Expired - Lifetime
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Cited By (2)
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---|---|---|---|---|
EP2445005A1 (en) * | 2010-10-22 | 2012-04-25 | Siemens Aktiengesellschaft | Cooling device with flat spring |
CN106134013A (en) * | 2014-03-27 | 2016-11-16 | 莫列斯有限公司 | High efficiency and heat radiation connector system |
Also Published As
Publication number | Publication date |
---|---|
TW441228B (en) | 2001-06-16 |
US20030096524A1 (en) | 2003-05-22 |
US6585534B2 (en) | 2003-07-01 |
AU5676499A (en) | 2000-03-14 |
US20010019913A1 (en) | 2001-09-06 |
US6722908B2 (en) | 2004-04-20 |
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