Source: http://www.google.com/patents/US6402537?dq=5987118
Timestamp: 2014-03-15 12:58:17
Document Index: 56116978

Matched Legal Cases: ['art 104', 'art) 10', 'art 5', 'art 50', 'Application No. 09', 'Application No. 09', 'Application No. 11', 'Application No. 2000']

Patent US6402537 - Socket for removably mounting an electronic part - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA socket (2) for removably mounting a BGA package. A plurality of contacts (7) are mounted in a base (4), the contacts each having a pair of arms (7 a and 7 b) for effecting compressive electrical contact of the solder balls of the BGA package being held. A slider (5) is slidably mounted on the base...http://www.google.com/patents/US6402537?utm_source=gb-gplus-sharePatent US6402537 - Socket for removably mounting an electronic partAdvanced Patent SearchPublication numberUS6402537 B2Publication typeGrantApplication numberUS 09/891,801Publication dateJun 11, 2002Filing dateJun 26, 2001Priority dateJul 7, 2000Fee statusPaidAlso published asUS20020004329Publication number09891801, 891801, US 6402537 B2, US 6402537B2, US-B2-6402537, US6402537 B2, US6402537B2InventorsKiyokazu IkeyaOriginal AssigneeTexas Instruments IncorporatedExport CitationBiBTeX, EndNote, RefManPatent Citations (12), Non-Patent Citations (1), Referenced by (16), Classifications (10), Legal Events (9) External Links: USPTO, USPTO Assignment, EspacenetSocket for removably mounting an electronic partUS 6402537 B2Abstract A socket (2) for removably mounting a BGA package. A plurality of contacts (7) are mounted in a base (4), the contacts each having a pair of arms (7 a and 7 b) for effecting compressive electrical contact of the solder balls of the BGA package being held. A slider (5) is slidably mounted on the base (4) for opening and closing of the arms. An external force is applied in a prescribed direction at a cam follower portion (52) of the slider by a cam member (20) provided on a diagonal line of a generally square base (4). The cam engages the cam follower portion (52) of the slider at a selected angle of inclination and is movable in a direction which crosses, at a right angle, the moving direction of the slider.
What is claimed: 1. Socket apparatus comprising
a base having a top surface and having an outer peripheral wall portion formed with a bore through the top surface and extending generally vertically relative to the top surface, a plurality of contact members mounted in the base in a selected arrangement, the contact members each having a pair of contact arms which are relatively movable between open and closed positions, a slider having an electronic part seating surface and having an engagement portion for engaging the contact members for moving the contact arms, the slider being slidably disposed on the top surface of the base and having an outer peripheral wall portion formed with a cam follower surface, a cam member having an elongated body of a selected length with a longitudinal axis and having an outer end, the body slidingly received in the bore of the base for generally vertical movement relative to the top surface of the base, a first spring member mounted in the base for urging the slider in a first contact closing direction, a second spring member mounted in the base for urging the cam member in a direction upwardly out of the bore, the cam member having a cam surface extending longitudinally along at least a portion of the length of the body, the cam follower surface being biased into engagement with the cam surface by the first spring member, the cam member having a force receiving surface at the outer end of the cam member whereby a force applied to the force receiving surface which depresses the cam member causes the cam surface to slide against the cam follower surface and move the slider and engagement portion in a second contact opening direction opposite to the first contact closing direction. 2. Socket apparatus according to claim 1 in which the body of the cam member is formed with a plurality of depressions in the cam surface to mitigate frictional resistance.
FIELD OF THE INVENTION This invention relates generally to electrical property and burn-in tests for electronic parts, such as integrated circuits, and more particularly to a socket for providing an electrical connection between each terminal of an electronic part and an external device for removably loading the electronic part in the socket so that the leads of the socket are electrically connected to the respective terminals of the electronic part.
BACKGROUND OF THE INVENTION Generally, electronic parts such as IC packages, in which IC chips have been sealed with plastic, are subjected to a reliability test called an electric property test or a burn-in test prior to their shipment in order to distinguish between acceptable and unacceptable products.
In electric property tests, input and output characteristics of the IC chips, pulse properties, noise leeway, and the like are tested. In burn-in tests, on the other hand, IC packages that have passed the electric property test are arranged in an oven and are made to function at an elevated temperature, 125� centigrade, for instance, and under a source voltage which is approximately 20% higher than the rated value. Those IC packages which fail in the burn-in test are removed as being unacceptable and only those others which continue functioning properly are shipped out as acceptable products.
BACKGROUND OF THE INVENTION FIGS. 6(a) and 6(b) show a conventional socket for loading a BGA package for a burn-in test. Socket 101 has a square-shaped base 102 and a slider 103 for loading BGA package 100 is arranged for movement in a horizontal direction on the base. A cover 104, having an opening 104 a therein, is received at the top of base 102. Cover 104 is vertically movable relative to base 102 by means of compression coil springs 105. A through hole is formed in slider 103 and base 102 corresponding to each solder ball 100 a of the BGA package. A respective contact 106 for electrical connection with each solder ball 100 a of the BGA package is arranged to extend through the through holes of base 102 and slider 103. Each contact 106 is made of an elongated metallic member with a pair of arms 106 a and 106 b facing upward. A protuberant part, not shown in the drawing, is provided on one arm of arms 106 a and 106 b (e.g., arm 106 a) and, as this protuberant part engages the partition wall of slider 103, arms 106 a and 106 b are adapted to open and close upon sliding motion of the slider. A sliding mechanism for moving slider 103 in a direction which is in parallel with the bottom wall of base 102 is provided on opposite sides of the slider. The sliding mechanism includes a generally L-shaped lever member 108 rotatably mounted on each end of a shaft 107 provided at one side of base 102 (the right side in the drawings) and the short arm 108 a of lever member 108 is rotatably linked to shaft 109 disposed in a vertically extending slot in slider 103 and which extends in parallel relation with shaft 107. A lever member 111 is rotatably mounted on each end of shaft 110 provided at the opposite side of base 102 and the tip of lever member 108 is slidingly attached by a pin 112 in a slot formed in each respective lever member 111 intermediate to its opposite ends. When cover 104 is not pressed, tip 111 a of each lever member 111 is adapted to touch the protuberant part 104 b of cover 104. Compression coil springs 113 are located in the vicinity of shaft 110 for biasing the slider toward the right as seen in the drawings.
SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus which overcomes the above noted limitations of the prior art. Another object of the invention is the provision of a socket in which the amount of opening of the arm-like contact part of the contact member can be predetermined at a certain value by means of the socket itself without depending upon the accuracy of the various parts of the jig.
BRIEF DESCRIPTION OF THE DRAWINGS Other objects, advantages and details of the novel and improved socket of the invention appear in the following detailed description of preferred embodiments of the invention, the detailed description referring to the drawings in which:
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS As shown in FIG. 1, electronic part loading system 1 made according to a preferred embodiment of the invention is for loading a BGA package (electronic part) 10 on which solder balls (connective terminals) 10 a are arranged according to a selected pattern. Loading system 1 comprises a socket 2 for removably mounting the BGA package and a combination electronic part delivery mechanism and contact opening and closing jig (contact opening and closing jig) 3 which is arranged facing the socket. With particular reference to FIG. 2(a), socket 2 comprises a base (main socket body) 4 and a slider (contact opening and closing member) 5 received on the base. The socket and slider are made using suitable resinous material such as polyether imide, etc. Base 4 is adapted for mounting on a wired substrate such as a printed substrate not shown in the drawing. The base is preferably formed in a rectangular configuration, such as a square, for example. As shown in FIG. 3, a stopper 6 is provided at the bottom of the base at the center thereof. A large number of spaced apart longitudinally extending members 7 are arranged at a prescribed height in a direction which is perpendicular to the top and bottom surfaces of base 4 and are fixed by stopper 6 in order to prevent the contact members from slipping toward the bottom side of the base. Contact members 7 are arranged in conformity with the pattern of solder balls 10 a of the BGA package 10 to be tested.
In the embodiment described above, if contact opening and closing jig 3 is lowered in the direction indicated by arrow head D, the force applying member 33 of contact opening and closing jig 3 engages and depresses head 20 a of cam member 20 until cam member 20 bottoms out against the surface 41 a of guide hole or bore 41 of base 4. Guide bore 41 is preferably formed so that its longitudinal axis E extends in a direction generally normal to the top surface of the base on which the slider moves. The cam follower portion 52 of slider 5 receives the external force from force applying member 33 through cam member 20 which includes a component in the direction which is indicated by arrow head A as the cam surface 20 b 2 of cam member 20 slides along the curved surface of cam follower portion 52 of slider 5, as shown in FIG. 3. In this connection, wearing of cam follower portion 52 of slider 5 and cam member 20 is minimized due to the linear engagement between the two parts. Thus, slider 5 moves in the direction indicated by arrow head A for a fixed distance in response to the fixed stroke of cam member 20 and the engagement part 5 a engages with arm 7 b of each contact member, thereby opening up contact arms 7 a and 7 b. BGA package 10 is placed on seating part 50 of slider 5 in the open contact arms state. The contact opening and closing jig 3 is then raised by the force of spring 21 in the direction indicated by arrow head C allowing cam member 20 to slide upwardly, thereby causing an action to take place which is opposite to that which has been described above. As a result, contact arms 7 a and 7 b of each contact member 7 are closed. Because of this, each solder ball 10 a of the BGA package is compressively contacted by respective arms 7 a and 7 b of a contact member.
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This application claims priority to Japanese Patent Application No. 2000-147533 filed May 19,2000.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS6793512 *Aug 9, 2002Sep 21, 2004Yamaichi Electronics Co., Ltd.Socket for semiconductor deviceUS6846190 *Apr 25, 2002Jan 25, 2005Tyco Electronics Amp K.K.IC socket and gripping sheet used in the sameUS6929497 *Jun 30, 2004Aug 16, 2005Suyin CorporationCPU socketUS6963492 *Jul 9, 2004Nov 8, 2005Via Technologies, Inc.Lockable retractable locating frame of a BGA on-top test socketUS6984142 *Dec 23, 2003Jan 10, 2006Enplas CorporationSocket for electrical partsUS7121860Sep 2, 2004Oct 17, 2006Micron Technology, Inc.Pinch-style support contact, method of enabling electrical communication with and supporting an IC package, and socket including sameUS7318736Aug 8, 2006Jan 15, 2008Sensata Technologies, Inc.Burn-in sockets for BGA IC devices having an integrated slider with full ball grid compatibilityUS7556507Dec 20, 2007Jul 7, 2009Yamaichi Electronics Co., Ltd.Cartridge for contact terminals and semiconductor device socket provided with the sameUS7563144Dec 20, 2007Jul 21, 2009Yamaichi Electronics Co., Ltd.Cartridge for contact terminals and semiconductor device socket provided with the sameUS7568918Sep 26, 2008Aug 4, 2009Yamaichi Electronics Co., Ltd.Socket for semiconductor deviceUS7601018 *Jan 9, 2006Oct 13, 2009Dong Weon HwangBGA-type test and burn-in socket for integrated circuits (ICs)US7607931 *Sep 4, 2008Oct 27, 2009Sharp Kabushiki KaishaTest socket adjustable to solid state image pickup devices of different sizesUS7618277Aug 29, 2005Nov 17, 2009Yamaichi Electronics Co., Ltd.Method of mounting and demounting a semiconductor device, device for mounting and demounting a semiconductor device using the same, and socket for a semiconductor deviceUS7661976 *Aug 21, 2008Feb 16, 2010Hon Hai Precision Ind. Co., Ltd.Electrical connector having improved electrical connection between contacts and pins of the package for minimizing the connectorUS7887355Oct 29, 2009Feb 15, 2011Yamaichi Electronics Co., Ltd.Semiconductor device socketUS8272882Dec 27, 2007Sep 25, 2012Yamaichi Electronics Co., Ltd.Semiconductor device socket* Cited by examinerClassifications U.S. Classification439/259, 439/342International ClassificationH05K7/10, H01L23/32, H01R13/193, H01R33/76Cooperative ClassificationH01R13/193, H05K7/1007European ClassificationH01R13/193, H05K7/10DLegal EventsDateCodeEventDescriptionNov 26, 2013FPAYFee paymentYear of fee payment: 12May 17, 2011ASAssignmentOwner name: SENSATA TECHNOLOGIES, INC., MASSACHUSETTSEffective date: 20110512Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:MORGAN STANLEY & CO. INCORPORATED;REEL/FRAME:026293/0352Owner name: SENSATA TECHNOLOGIES MASSACHUSETTS, INC., MASSACHUOwner name: SENSATA TECHNOLOGIES FINANCE COMPANY, LLC, MASSACHNov 20, 2009FPAYFee paymentYear of fee payment: 8Aug 28, 2008ASAssignmentOwner name: MORGAN STANLEY & CO. INCORPORATED, NEW YORKFree format text: SECURITY AGREEMENT;ASSIGNOR:SENSATA TECHNOLOGIES MASSACHUSETTS, INC.;REEL/FRAME:021450/0563Effective date: 20080430May 29, 2008ASAssignmentOwner name: SENSATA TECHNOLOGIES MASSACHUSETTS, INC., MASSACHUFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SENSATA TECHNOLOGIES, INC.;REEL/FRAME:021018/0690Effective date: 20080430Jun 22, 2006ASAssignmentOwner name: SENSATA TECHNOLOGIES, INC., MASSACHUSETTSFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TEXAS INSTRUMENTS INCORPORATED;REEL/FRAME:017870/0147Effective date: 20060427May 5, 2006ASAssignmentOwner name: MORGAN STANLEY & CO. INCORPORATED, NEW YORKFree format text: SECURITY AGREEMENT;ASSIGNORS:SENSATA TECHNOLOGIES, INC.;SENSATA TECHNOLOGIES FINANCE COMPANY, LLC;REEL/FRAME:017575/0533Effective date: 20060427Nov 23, 2005FPAYFee paymentYear of fee payment: 4Jun 26, 2001ASAssignmentOwner name: TEXAS INSTRUMENTS INCORPORATED, TEXASFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IKEYA, KIYOKAZU;TEXAS INSTRUMENTS JAPAN LTD.;REEL/FRAME:011950/0358;SIGNING DATES FROM 20010615 TO 20010621Owner name: TEXAS INSTRUMENTS INCORPORATED MS 3999 7839 CHURCHFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IKEYA, KIYOKAZU /AR;REEL/FRAME:011950/0358;SIGNING DATESFROM 20010615 TO 20010621RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google