Circuits Assembly - December 2008 - (Page 47)

Eastern Advances Continued from pg. 43 Special Advertising Section Assembly Insider Instant Online Quotes, Day or Night SPECIAL LIMITED-TIME PROMOTION Delivered, all testing and shipping included: Single/Double-Sided $79.99 1st piece $29.99 up to 5th piece allow 7 working days 4、安装孔的设计理念 a) 当安装孔是冲制的，并是方孔时，注意设计时4角R的取值，PCB基材优选室温冲裁型，以杜绝裂纹的产生，R的取值一般是0.2-0.5mm。 b) 安装孔周边区域与其支撑面间除了SM外，还应有白标志油墨做为保护层。从可靠性出发，PCB与其所有支撑面间都应有尽可能多的防护设计。 c) 安装孔周边受组装时的应力会造成附近焊点在震动时早期失效，在手持或车载产品中屡见不鲜，要正确应对，设立元器件避让区。 d) 安装孔是PTH时，且被借用于定位。当定位销是用于丝印的平顶销时，过盈的配合会产生刮挤下的铜屑制成短路，我公司加工的某款产品在这方面造成了非常大的麻烦。 e) 安装孔需手工补焊的加强PAD，应有如图Figure 19的设计。在电子组装业高速发展的今天，大规模量产的实战技术（细节）的获取十分不易，若能处处对那些看似奇怪且不理解的设计及方法潜心琢磨，当能对大品牌公司的Know-How略窥一斑，其次是关注失败，不论是他人的还是自己的，力求涉及根本原因，并制定有效的不重犯对策，希望今后在上述两方面与同行们多做交流，共同进步。例证是可利用的在 circuitsassembly.com/cms/images/stories/ ArticleImages/0810/0810eastern_ online.pdf n Even One Piece, We Care!! 4-Layer $129.99 1st piece $79.99 up to 5th piece allow 8 working days 6-Layer $149.99 1st piece $99.99 up to 5th piece allow 9 working days Based on standard specifications. See the HOME page and Calculate for other options. Register to receive other special promotions. www.jetpcb.com/eng VISIT For anWWW.JETPCB.COM/ENG instant PCB Quote visit FOR OTHER PROMOTIONAL www.jetpcb.com/eng LOW-COST PCB PROTOTYPES Stake Out Your Territory Learn how by calling Krista Fabian today at 678-589-8840. Get your Mirae daily dose circuitsassembly.com of PCB industry news and views. Subscribe to PCB UPdate www.pcbupdate.com Email: ppm@goppm.com or Call: 603.895.5112 Circuits Assembly DECEMBER 2008 47 http://www.jetpcb.com/eng http://www.bareboard.com http://www.bareboard.com http://www.goppm.com http://www.sembly.com/cms/images/stories/ArticleImages/0810/0810eastern_online.pdf http://www.sembly.com/cms/images/stories/ArticleImages/0810/0810eastern_online.pdf http://www.sembly.com/cms/images/stories/ArticleImages/0810/0810eastern_online.pdf http://www.pcbupdate.com http://www.circuitsassembly.com Table of Contents for the Digital Edition of Circuits Assembly - December 2008Circuits Assembly - December 2008ContentsCaveat LectorIndustry NewsMarket WatchGlobal SourcingScreen PrintingBetter ManufacturingThe Plexus RxIn MemoriamHIP Defects in BGAsTech TipsTest and InspectionWave SolderingProcess DoctorPb-Free Lessons LearnedThe Defects DatabaseStandardsGetting LeanEastern AdvancesProduct SpotlightAd IndexAssembly InsiderTechnical AbstractsCircuits Assembly - December 2008Circuits Assembly - December 2008 - Circuits Assembly - December 2008 (Page Cover1)Circuits Assembly - December 2008 - Circuits Assembly - December 2008 (Page Cover2)Circuits Assembly - December 2008 - Circuits Assembly - December 2008 (Page 1)Circuits Assembly - December 2008 - Circuits Assembly - December 2008 (Page 2)Circuits Assembly - December 2008 - Contents (Page 3)Circuits Assembly - December 2008 - Contents (Page 4)Circuits Assembly - December 2008 - Contents (Page 5)Circuits Assembly - December 2008 - Caveat Lector (Page 6)Circuits Assembly - December 2008 - Caveat Lector (Page 7)Circuits Assembly - December 2008 - Industry News (Page 8)Circuits Assembly - December 2008 - Industry News (Page 9)Circuits Assembly - December 2008 - Industry News (Page 10)Circuits Assembly - December 2008 - Industry News (Page 11)Circuits Assembly - December 2008 - Industry News (Page 12)Circuits Assembly - December 2008 - Industry News (Page 13)Circuits Assembly - December 2008 - Industry News (Page 14)Circuits Assembly - December 2008 - Industry News (Page 15)Circuits Assembly - December 2008 - Market Watch (Page 16)Circuits Assembly - December 2008 - Market Watch (Page Best1)Circuits Assembly - December 2008 - Market Watch (Page Best2)Circuits Assembly - December 2008 - Global Sourcing (Page 17)Circuits Assembly - December 2008 - Screen Printing (Page 18)Circuits Assembly - December 2008 - Better Manufacturing (Page 19)Circuits Assembly - December 2008 - The Plexus Rx (Page 20)Circuits Assembly - December 2008 - The Plexus Rx (Page 21)Circuits Assembly - December 2008 - The Plexus Rx (Page 22)Circuits Assembly - December 2008 - The Plexus Rx (Page 23)Circuits Assembly - December 2008 - The Plexus Rx (Page 24)Circuits Assembly - December 2008 - The Plexus Rx (Page 25)Circuits Assembly - December 2008 - In Memoriam (Page 26)Circuits Assembly - December 2008 - In Memoriam (Page 27)Circuits Assembly - December 2008 - HIP Defects in BGAs (Page 28)Circuits Assembly - December 2008 - HIP Defects in BGAs (Page 29)Circuits Assembly - December 2008 - HIP Defects in BGAs (Page 30)Circuits Assembly - December 2008 - HIP Defects in BGAs (Page 31)Circuits Assembly - December 2008 - Tech Tips (Page 32)Circuits Assembly - December 2008 - Test and Inspection (Page 33)Circuits Assembly - December 2008 - Wave Soldering (Page 34)Circuits Assembly - December 2008 - Wave Soldering (Page 35)Circuits Assembly - December 2008 - Process Doctor (Page 36)Circuits Assembly - December 2008 - Pb-Free Lessons Learned (Page 37)Circuits Assembly - December 2008 - Pb-Free Lessons Learned (Page 38)Circuits Assembly - December 2008 - The Defects Database (Page 39)Circuits Assembly - December 2008 - Standards (Page 40)Circuits Assembly - December 2008 - Standards (Page 41)Circuits Assembly - December 2008 - Getting Lean (Page 42)Circuits Assembly - December 2008 - Eastern Advances (Page 43)Circuits Assembly - December 2008 - Product Spotlight (Page 44)Circuits Assembly - December 2008 - Product Spotlight (Page 45)Circuits Assembly - December 2008 - Ad Index (Page 46)Circuits Assembly - December 2008 - Assembly Insider (Page 47)Circuits Assembly - December 2008 - Technical Abstracts (Page 48)Circuits Assembly - December 2008 - Technical Abstracts (Page Cover3)Circuits Assembly - December 2008 - Technical Abstracts (Page Cover4)http://www.nxtbook.com/nxtbooks/upmg/ca_200812http://www.nxtbook.com/nxtbooks/upmg/ca_200811http://www.nxtbook.com/nxtbooks/upmg/ca_200810http://www.nxtbook.com/nxtbooks/upmg/ca_200809http://www.nxtbook.com/nxtbooks/upmg/ca_200808http://www.nxtbook.com/nxtbooks/upmg/ca_200807http://www.nxtbook.com/nxtbooks/upmg/ca_200806http://www.nxtbook.com/nxtbooks/upmg/ca_200804http://www.nxtbook.com/nxtbooks/upmg/ca_200803http://www.nxtbook.com/nxtbooks/upmg/ca_200802http://www.nxtbook.com/nxtbooks/upmg/ca_200801http://www.nxtbook.com/nxtbooks/upmg/ca_200712http://www.nxtbook.com/nxtbooks/upmg/ca_200711http://www.nxtbookMEDIA.com

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