zh-cnGoodspeed Rss6Fri, 09 Jan 2009 03:17:30 GMTThu, 06 Nov 2008 10:23:52 GMThttp://www.sichinamag.com/blog/pcbsxl5/40309/message.aspx<p class="MsoNormal" style="MARGIN: 5.75pt 0cm 0pt; LINE-HEIGHT: 14.4pt; TEXT-ALIGN: center; mso-pagination: widow-orphan" align="center"><b style="mso-bidi-font-weight: normal"><span style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">多层<span lang="EN-US">pcb</span>抄板过孔的常识 <span lang="EN-US"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></span></b></p> <p class="MsoNormal" style="MARGIN: 5.75pt 0cm 0pt; LINE-HEIGHT: 14.4pt; TEXT-ALIGN: center; mso-pagination: widow-orphan" align="center"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">本文出自：</span><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: #666699; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><a href="http://www.pcbwork.net/"><span style="COLOR: #666699">http://www.pcbwork.net</span></a></span><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-line-height-rule: exactly" align="left"><span class="tpccontent"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma">过孔（<span lang="EN-US">via</span>）是多层<span lang="EN-US">PCB</span>抄板的重要组成部分之一，钻孔的费用通常占<b style="mso-bidi-font-weight: normal"><span lang="EN-US"><a href="http://www.pcbvoip.cn/"><span style="COLOR: black; TEXT-DECORATION: none; text-underline: none">PCB</span><span lang="EN-US" style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><span lang="EN-US">抄板</span></span></a></span></b>费用的<span lang="EN-US">30%</span>到<span lang="EN-US">40%</span>。简单的说来，<span lang="EN-US">PCB</span>上的每一个孔都可以称之为过孔。从作用上看，过孔可以分成两类：一是用作各层间的电气连接；二是用作器件的固定或定位。如果从工艺制程上来说，这些过孔一般又分为三类，即盲孔<span lang="EN-US">(blind via)</span>、埋孔<span lang="EN-US">(buried via)</span>和通孔<span lang="EN-US">(through via)</span>。盲孔位于抄板的顶层和底层表面，具有一定深度，用于表层线路和下面的内层线路的连接，孔的深度通常不超过一定的比率<span lang="EN-US">(</span>孔径<span lang="EN-US">)</span>。埋孔是指位于<span lang="EN-US">PCB</span>抄板内层的连接孔，它不会延伸到抄板的表面。上述两类孔都位于线路板的内层，层压前利用通孔成型工艺完成，在过孔形成过程中可能还会重叠做好几个内层。第三种称为通孔，这种孔穿过整个线路板，可用于实现内部互连或作为元件的安装定位孔。由于通孔在工艺上更易于实现，成本较低，所以绝大部分<span lang="EN-US">PCB</span>抄板均使用它，而不用另外两种过孔。以下所说的过孔，没有特殊说明的，均作为通孔考虑。</span></span><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体"><br><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span><span class="tpccontent"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma">从<span lang="EN-US"><a href="http://www.x5dj.com/pcbpcbsxl/"><b style="mso-bidi-font-weight: normal"><span style="COLOR: black; TEXT-DECORATION: none; text-underline: none">pcb</span></b><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="COLOR: black; TEXT-DECORATION: none; text-underline: none"><span lang="EN-US">设计</span></span></b></a></span>的角度来看，一个过孔主要由两个部分组成，一是中间的钻孔（<span lang="EN-US">drill hole</span>）<span lang="EN-US">,</span>二是钻孔周围的焊盘区，见下图。这两部分的尺寸大小决定了过孔的大小。很显然，在高速<span lang="EN-US">,</span>高密度的<span lang="EN-US">PCB</span>设计时，设计者总是希望过孔越小越好，这样板上可以留有更多的布线空间，此外，过孔越小，其自身的寄生电容也越小，更适合用于高速电路。但孔尺寸的减小同时带来了成本的增加，而且过孔的尺寸不可能无限制的减小，它受到钻孔<span lang="EN-US">(drill)</span>和电镀（<span lang="EN-US">plating</span>）等工艺技术的限制：孔越小，钻孔需花费的时间越长，也越容易偏离中心位置；且当孔的深度超过钻孔直径的<span lang="EN-US">6</span>倍时，就无法保证孔壁能均匀镀铜。比如，现在正常的一块<span lang="EN-US">6</span>层<span lang="EN-US">PCB</span>抄板的厚度（通孔深度）为<span lang="EN-US">50Mil</span>左右，所以<span lang="EN-US">PCB</span>厂家能提供的钻孔直径最小只能达到<span lang="EN-US">8Mil</span>。<span lang="EN-US"><o:p></o:p></span></span></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-line-height-rule: exactly" align="left"><span class="tpccontent"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Tahoma">有关<span lang="EN-US">PCB</span>抄板资料详见：<span lang="EN-US"><a href="http://pcbsxl01.blog.hexun.com/">http://pcbsxl01.blog.hexun.com/</a><o:p></o:p></span></span></span></p>http://www.sichinamag.com/blog/pcbsxl5/40309/message.aspx IC设计与软件Thu, 09 Oct 2008 12:06:45 GMThttp://www.sichinamag.com/blog/pcbsxl5/37160/message.aspx<p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24.1pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: center; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-pagination: widow-orphan" align="center"><strong><span class="articletitletext1"><span style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体">抄板<span lang="EN-US">,PCB</span>抄板<span lang="EN-US">,</span>改板<span lang="EN-US">,</span>电路板抄板<span lang="EN-US">,BOM</span>表</span></span><span lang="EN-US" style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></strong></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left" align="left"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">0755-</span><span lang="EN-US"> </span><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">83003609 </span><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">『深圳专业的<span lang="EN-US">PCB</span>设计公司』是一家专业印刷电路板<span lang="EN-US">,PCB</span>克隆<span lang="EN-US">,PCB</span>设计<span lang="EN-US">,</span>芯片解密<span lang="EN-US">,IC</span>解密<span lang="EN-US">,</span>制板公司<span lang="EN-US">,</span>我们拥有<span lang="EN-US">10</span>多年<span lang="EN-US">PCB</span>克隆<span lang="EN-US">,PCB</span>打样<span lang="EN-US">,SMT</span>加工<span lang="EN-US">,</span>制板经验，精通各种高频板、高速单、双、多层印刷电路板、设计。<span lang="EN-US">0755-</span></span><span lang="EN-US"> </span><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">83003609<br></span><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">一、<span lang="EN-US">PCB</span>抄板、设计中心对外承接以下<span lang="EN-US">PCB</span>设计项目：<span lang="EN-US"><br>1</span>、通讯产品：卫星通信基站系统主板、<span lang="EN-US">GPS</span>基站与终端<span lang="EN-US">PCB</span>、手机主板；<span lang="EN-US"> <br>2</span>、电脑网络产品：交换机、计算机主板、板卡、工控板、显示器（<span lang="EN-US">CRT </span>或<span lang="EN-US">LCD</span>）主板，光纤卡<span lang="EN-US">...</span>等；<span lang="EN-US"><br>3</span>、承接开发成果：数字<span lang="EN-US">/</span>模拟语音卡，<span lang="EN-US">ARM7&amp;ARM9</span>开发板，<span lang="EN-US">ARM</span>仿真器系列 ，<span lang="EN-US"> Qloigc</span>光纤卡系列，以太网<span lang="EN-US">TCP/IP</span>系列，汽车电子与系统设计，以太网光电转换器，无线通信<span lang="EN-US">...<br></span>详情请登陆：</span><u><span lang="EN-US" style="COLOR: blue">http://www.pcbwork.net<o:p></o:p></span></u></p> <p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-pagination: widow-orphan" align="left"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">二、<span lang="EN-US">1-28</span>层<span lang="EN-US">PCB</span>板<span lang="EN-US">Layout</span>、克隆（抄板）、改板、<span lang="EN-US">PCB Layout</span>、原理图及<span lang="EN-US">BOM</span>单制作、芯片解密、<span lang="EN-US">PCB</span>生产、成品加工等制板技术能力 最小孔径：<span lang="EN-US">0.3mm<br></span>最小线宽<span lang="EN-US">/</span>间距：<span lang="EN-US">0.1/0.1mm<br></span>最大板面尺寸：<span lang="EN-US">550*600mm<br></span>成品板厚：<span lang="EN-US">0.25-3.0mm<br></span>最小内层厚度：<span lang="EN-US">0.15mm<br></span>表面涂层：喷锡、镍金、无电镍金，防氧化处理<span lang="EN-US"><br></span>金手指电镀：金厚按客户要求<span lang="EN-US"><br></span>三．承接高速<span lang="EN-US">PCB</span>设计<span lang="EN-US"><br>(1) </span>高速率、高密度、数模混合、<span lang="EN-US">R</span>设计<span lang="EN-US"><br>(2) </span>新工艺、新技术的<span lang="EN-US">PCB</span>设计<span lang="EN-US">(</span>如板<span lang="EN-US">HDI</span>埋盲孔等）<span lang="EN-US"><br>(3) </span>对原理图设计错误或隐患进行检查提供更改建议<span lang="EN-US"><br>(4) </span>多人同步进行<span lang="EN-US">PCB</span>板设计<span lang="EN-US">,</span>保证设计进度注：<span lang="EN-US">PCB</span>设计需求资料：原理图或网表<span lang="EN-US">(Netlist</span>）结构图（板尺寸、器件定位信息封装资料（<span lang="EN-US">Datasheet</span>）<span lang="EN-US"><br></span>我们承诺在第一时间为您满足您的需求！<span lang="EN-US"><o:p></o:p></span></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left" align="left"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">全国最有实力的<span lang="EN-US">PCB</span>设计<span lang="EN-US">,</span>抄板公司<span lang="EN-US">! </span>想抄板找龙人<span lang="EN-US"><br></span>公司主页：</span><u><span lang="EN-US" style="COLOR: blue">http://www.pcbwork.net<o:p></o:p></span></u></p> <p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-pagination: widow-orphan" align="left"><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">联系地址：深圳市福田区（华强北）世界贸易广场<span lang="EN-US">B</span>座<span lang="EN-US">12F/13F&nbsp;&nbsp;&nbsp; </span>邮编：<span lang="EN-US">518033 <br></span>联系电话：<span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>联系人：<span lang="EN-US"><br>0755-83000991&nbsp; 25327575&nbsp; 13148818895&nbsp;&nbsp;&nbsp; </span>余小姐：样机制作、芯片解密等<span lang="EN-US"><br>0755-83000896</span>　<span lang="EN-US">83000816</span>　<span lang="EN-US">13249820801</span>　<span lang="EN-US">&nbsp; </span>张小姐：<span lang="EN-US">PCB</span>抄板、设计、改板、改板等<span lang="EN-US"><br>0755-83798230</span>　<span lang="EN-US">82798235&nbsp; 13242082561&nbsp;&nbsp;&nbsp; </span>任小姐：<span lang="EN-US">OEM/ODM</span>制造、芯片采购等<span lang="EN-US"><br>0755-83346919&nbsp; 83346929&nbsp; 13380363999&nbsp;&nbsp;&nbsp; </span>夏先生：大客户，疑难软件、硬件项目开发<span lang="EN-US"><br></span>传　　真：<span lang="EN-US">0755-83676377</span>　<span lang="EN-US"> <br>E-----mail</span>：<span lang="EN-US"><a href="mailto:pcblab@163.com"><font color="#b03801">pcblab@163.com</font></a><o:p></o:p></span></span></p> <p class="MsoNormal" style="BACKGROUND: white; MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-line-height-rule: exactly; mso-pagination: widow-orphan" align="left"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">SMT </span><span style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">工 厂<span lang="EN-US"><br></span>工厂地址：深圳市宝安区沙井镇壆岗村第一工业区新沙公路<span lang="EN-US">450</span>号<span lang="EN-US"><o:p></o:p></span></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><span lang="EN-US">PCB</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">抄板相关资料详见：</span><span lang="EN-US"><a href="http://pcbsxl01.blog.hexun.com/">http://pcbsxl01.blog.hexun.com/</a></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-line-height-rule: exactly" align="left"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>http://www.sichinamag.com/blog/pcbsxl5/37160/message.aspx IC设计与软件Tue, 23 Sep 2008 14:06:01 GMThttp://www.sichinamag.com/blog/pcbsxl5/36236/message.aspx<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24.1pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: center; mso-char-indent-count: 2.0; mso-line-height-rule: exactly" align="center"><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体">PCB</span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-SIZE: 12pt; COLOR: black; FONT-FAMILY: 宋体">印刷线路抄板入门简介<span lang="EN-US"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></span></b></p><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://www.pcbwork.net/"><font face="宋体">PCB<span lang="EN-US"><span lang="EN-US">抄板</span></span></font></a></span><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">是英文<span lang="EN-US">(Printed Circuie Board)</span>印制线路板的简称。通常把在绝缘材上，按预定设计，制成<span lang="EN-US">PCB</span>印制线路、印制元件或两者组合而成的导电图形称为印制电路。而在绝缘基材上提供元器件之间电气连接的导电图形，称为<span lang="EN-US">PCB</span>印制线路。这样就把<span lang="EN-US">PCB</span>印制电路或印制线路的成品板称为印制线路板，亦称为印制板或印制电路板。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">PCB</span><span style="FONT-SIZE: 9pt; COLOR: black">抄板几乎我们能见到的电子设备都离不开它，小到电子手表、计算器、通用电脑，大到计算机、通迅电子设备、军用武器系统，只要有集成电路等电子无器件，它们之间电气互连都要用到<span lang="EN-US">PCB</span>。它提供集成电路等各种电子元器件固定装配的机械支撑、实现集成电路等各种电子元器件之间的布线和电气连接或电绝缘、提供所要求的电气特性，如特性阻抗等。同时为自动锡焊提供阻焊图形；为元器件插装、检查、维修提供识别字符和图形。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">PCB</span><span style="FONT-SIZE: 9pt; COLOR: black">是如何制造出来的呢？我们打开通用电脑的健盘就能看到一张软性薄膜（挠性的绝缘基材），印上有银白色（银浆）的导电图形与健位图形。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">因为通用丝网漏印方法得到这种图形，所以我们称这种印制线路板为挠性银浆<span lang="EN-US"><a href="http://www.ldpcb.com/pcbcopy.htm"><span lang="EN-US"><span lang="EN-US">印制线路板</span></span></a></span>。而我们去电脑城看到的各种电脑主机板、显卡、网卡、调制解调器、声卡及家用电器上的印制电路板就不同了。它所用的基材是由纸基（常用于单面）或玻璃布基（常用于双面及多层），预浸酚醛或环氧树脂，表层一面或两面粘上覆铜簿再层压固化而成。这种线路板覆铜簿板材，我们就称它为刚性板。再制成印制线路板，我们就称它为刚性印制线路板。单面有印制线路图形我们称单面印制线路板，双面有印制线路图形，再通过孔的金属化进行双面互连形成的印制线路板，我们就称其为双面板。如果用一块双面作内层、二块单面作外层或二块双面作内层、二块单面作外层的印制线路板，通过定位系统及绝缘粘结材料交替在一起且导电图形按设计要求进行互连的印制线路板就成为四层、六层印制电路板了，也称为多层印制线路板。现在已有超过<span lang="EN-US">100</span>层的实用印制线路板了。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">PCB</span><span style="FONT-SIZE: 9pt; COLOR: black">的生产过程较为复杂，它涉及的工艺范围较广，从简单的机械加工到复杂的机械加工，有普通的化学反应还有光化学电化学热化学等工艺，计算机辅助设计<span lang="EN-US">CAM</span>等多方面的知识。而且在生产过程中工艺问题很多而且会时时遇见新的问题而部分问题在没有查清原因问题就消失了，由于其生产过程是一种非连续的流水线形式，任何一个环节出问题都会造成全线停产或大量报废的后果，印刷线路板如果报废是无法回收再利用的，工艺工程师的工作压力较大，所以许多工程师离开了这个行业转到印刷线路板设备或材料商做销售和技术服务方面的工作。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">为进一认识<span lang="EN-US"><a href="http://www.x5dj.com/pcbpcbsxl/">PCB</a></span>我们有必要了解一下通常单面、双面印制线路板及普通多层板的制作工艺，于加深对它的了解。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">单面刚性印制板：→单面覆铜板→下料→（刷洗、干燥）→钻孔或冲孔→网印线路抗蚀刻图形或使用干膜→固化检查修板→蚀刻铜→去抗蚀印料、干燥→刷洗、干燥→网印阻焊图形（常用绿油）、<span lang="EN-US">UV</span>固化→网印字符标记图形、<span lang="EN-US">UV</span>固化→预热、冲孔及外形→电气开、短路测试→刷洗、干燥→预涂助焊防氧化剂（干燥）或喷锡热风整平→检验包装→成品出厂。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">双面刚性印制板：→双面覆铜板→下料→叠板→数控钻导通孔→检验、去毛刺刷洗→化学镀（导通孔金属化）→（全板电镀薄铜）→检验刷洗→网影）→检验、修板→线路图形电镀→电镀锡（抗蚀镍<span lang="EN-US">/</span>金）→去印料（感光膜）→蚀刻铜→（退锡）→清洁刷洗→网印阻焊图形常用热固化绿油（贴感光干膜或湿膜、曝光、显影、热固化，常用感光热固化绿油）→清洗、干燥→网印标记字符图形、固化→（喷锡或有机保焊膜）→外形加工→清洗、干燥→电气通断检测→检验包装→成品出厂。贯通孔金属化法制造多层板工艺流程→内层覆铜板双面开料→刷洗→钻定位孔→贴光致抗蚀干膜或涂覆光致抗蚀剂→曝光→显影→蚀刻与去膜→内层粗化、去氧化→内层检查→（外层单面覆铜板线路制作、<span lang="EN-US">B</span>—阶粘结片、板材粘结片检查、钻定位孔）→层压→数控制钻孔→孔检查→孔前处理与化学镀铜→全板镀薄铜→镀层检查→贴光致耐电镀干膜或涂覆光致耐电镀剂→面层底板曝光→显影、修板→线路图形电镀→电镀锡铅合金或镍<span lang="EN-US">/</span>金镀→去膜与蚀刻→检查→网印阻焊图形或光致阻焊图形→印制字符图形→（热风整平或有机保焊膜）→数控洗外形→清洗、干燥→电气通断检测→成品检查→包装出厂。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">从工艺流程图可以看出多层板工艺是从双面孔金属化工艺基础上发展起来的。它除了继了双面工艺外，还有几个独特内容：金属化孔内层互连、钻孔与去环氧钻污、定位系统、层压、专用材料。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">我们常见的电脑板卡基本上是环氧树脂玻璃布基双面印制线路板，其中有一面是插装元件另一面为元件脚焊接面，能看出焊点很有规则，这些焊点的元件脚分立焊接面我们就叫它为焊盘。为什么其它铜导线图形不上锡呢。因为除了需要锡焊的焊盘等部分外，其余部分的表面有一层耐波峰焊的阻焊膜。其表面阻焊膜多数为绿色，有少数采用黄色、黑色、蓝色等，所以在<span lang="EN-US">PCB</span>行业常把阻焊油叫成绿油。其作用是，防止波焊时产生桥接现象，提高焊接质量和节约焊料等作用。它也是印制板的永久性保护层，能起到防潮、防腐蚀、防霉和机械擦伤等作用。从外观看，表面光滑明亮的绿色阻焊膜，为菲林对板感光热固化绿油。不但外观比较好看，便重要的是其焊盘精确度较高，从而提高了焊点的可靠性。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">我们从电脑板卡可以看出，元件的安装有三种方式。一种为传动的插入式安装工艺，将电子元件插入印制线路板的导通孔里。这样就容易看出双面印制线路板的导通孔有如下几种：一是单纯的元件插装孔；二是元件插装与双面互连导通孔；三是单纯的双面导通孔；四是基板安装与定位孔。另二种安装方式就是表面安装与芯片直接安装。其实芯片直接安装技术可以认为是表面安装技术的分支，它是将芯片直接粘在印制板上，再用线焊法或载带法、倒装法、梁式引线法等封装技术互联到印制板上。其焊接面就在元件面上。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">表面安装技术有如下优点：<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">1</span><span style="FONT-SIZE: 9pt; COLOR: black">） 由于印制板大量消除了大导通孔或埋孔互联技术，提高了印制板上的布线密度，减少了印制板面积（一般为插入式安装的三分阶之一），同时还可降低印制板的设计层数与成本。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">2</span><span style="FONT-SIZE: 9pt; COLOR: black">） 减轻了重量，提高了抗震性能，采用了胶状焊料及新的焊接技术，提高了产品质量和可靠性。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">3</span><span style="FONT-SIZE: 9pt; COLOR: black">） 由于布线密度提高和引线长度缩短，减少了寄生电容和寄生电感，更有利于提高印制板的电参数。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">4</span><span style="FONT-SIZE: 9pt; COLOR: black">） 比插装式安装更容易实现自动化，提高安装速度与劳动生产率，相应降低了组装成本。<span lang="EN-US"><o:p></o:p></span></span></font></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">从以上的表面安技术就可以看出，线路板技术的提高是隋芯片的封装技术与表面安装技术的提高而提高。现在我们看的电脑板卡其表面粘装率都不<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">断地在上升。实际上这种的线路板再用传动的网印线路图形是无法满足技术要求的了。所以普通高精确度线路板，其线路图形及阻焊图形基本上采用感光线路与感光绿油制作工艺。<span lang="EN-US"><o:p></o:p></span></font></span></pre><pre style="TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span style="FONT-SIZE: 9pt; COLOR: black"><font face="宋体">随着线路板高密度的发展趋势，线路板的生产要求越来越高，越来越多的新技术应用于线路板的生产，如激光技术，感光树脂等等。以上仅仅是一些表面的肤浅的介绍，线路板生产中还有许多东西因篇幅限制没有说明，如盲埋孔、绕性板、特氟珑板，光刻技术等等。如要深入的研究还需自己努力。<span lang="EN-US"><o:p></o:p></span></font></span></pre> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: left; mso-char-indent-count: 2.0; mso-line-height-rule: exactly" align="left"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体"><o:p>&nbsp;</o:p></span></p>http://www.sichinamag.com/blog/pcbsxl5/36236/message.aspx IC设计与软件Fri, 22 Aug 2008 12:03:03 GMThttp://www.sichinamag.com/blog/pcbsxl5/30685/message.aspx<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 30.1pt; LINE-HEIGHT: 18pt; TEXT-ALIGN: center; mso-char-indent-count: 2.0; mso-line-height-rule: exactly" align="center"><b><span style="FONT-SIZE: 15pt; COLOR: #cc3333; FONT-FAMILY: 宋体; mso-ascii-font-family: &#718;&#805;; mso-hansi-font-family: &#718;&#805;">简析影响中国</span></b><b><span lang="EN-US" style="FONT-SIZE: 15pt; COLOR: #cc3333; FONT-FAMILY: &#718;&#805;"><a href="http://www.pcb-ic.com/">PCB</a></span></b><b><span style="FONT-SIZE: 15pt; COLOR: #cc3333; FONT-FAMILY: 宋体; mso-ascii-font-family: &#718;&#805;; mso-hansi-font-family: &#718;&#805;">产业的部分因素</span></b><b><span lang="EN-US" style="FONT-SIZE: 15pt; COLOR: #cc3333; FONT-FAMILY: &#718;&#805;"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></b></p> <p style="BACKGROUND: #fcfcfc; MARGIN: 0cm 5.75pt 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt"><span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol"><span style="mso-list: Ignore">·<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><font face="宋体">中国自<span lang="EN-US">“</span>十一五<span lang="EN-US">”</span>以来，正在积极进行各个产业的调整及升级，其中也包括了<span lang="EN-US">PCB</span>产业。自<span lang="EN-US">2007</span>年以来不断调整的货币政策及陆续颁布的各项法令等等，都对<span lang="EN-US">PCB</span>厂商的经营环境产生相当大的影响。人民币升值　一些以出口为主的<span lang="EN-US"><a href="http://www.dmpcb.cn/">PCB</a></span>厂商，出口计价主要币种为美金，至于其它计价币种采用的比重较少，所以在外汇避险上通过币种转变的空间不多，较多厂商采用契约为约定汇率，或一定程度的汇率调整空间做为再议价的基础。由于人民币不断升值，各个厂商收到美金后转换为人民币之数额定会减少，导致厂商出口成本提高，影响了<span lang="EN-US"><a href="http://hexun.com/pcbonly">PCB<span lang="EN-US"><span lang="EN-US">出口</span></span></a></span>价格。</font></p> <p style="BACKGROUND: #fcfcfc; MARGIN: 0cm 5.75pt 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt"><span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol"><span style="mso-list: Ignore">·<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><font face="宋体">根据大致统计：目前<span lang="EN-US">PCB</span>各厂的成本结构约为人工成本占<span lang="EN-US">10</span>％、制造成本占<span lang="EN-US">50</span>％、材料成本占<span lang="EN-US">40</span>％，在假设人民币升值<span lang="EN-US">10</span>％的情况下，成本就会提升<span lang="EN-US">2</span>％～<span lang="EN-US">6</span>％左右。</font></p> <p style="BACKGROUND: #fcfcfc; MARGIN: 0cm 5.75pt 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt"><span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol"><span style="mso-list: Ignore">·<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><font face="宋体">劳动合同法自<span lang="EN-US">2008</span>年<span lang="EN-US">1</span>月<span lang="EN-US">1</span>日中国开始施行新的劳动合同法，此次的法令政策修正，使劳动者工作权及劳动者福利得到保障，其中增加了企业的作业程序、劳动者的无固定期限劳动合同、合法休假及必需提供足额的五金<span lang="EN-US">(</span>养老、失业、工伤、疾病、生育保险金<span lang="EN-US">)</span>等等，在一定程度上也大大的增加了企业的人工成本的支出。预估，劳动合同法的推行将提高人工成本<span lang="EN-US">10</span>％左右。</font></p> <p style="BACKGROUND: #fcfcfc; MARGIN: 0cm 5.75pt 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt"><span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol"><span style="mso-list: Ignore">·<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><font face="宋体">环保法令对于<span lang="EN-US"><a href="http://hexun.com/pcbsxl4">PCB</a></span>厂家而言，新设厂以及已设厂的企业都面临着不同的困境。新设厂家申请设厂时，所递交的申请书上含有电镀字眼，即遭受拒绝不允许设厂，包括载板厂家所面临的也是如此。已设厂的企业所面对的则是废水量问题，政府在废水排放量及回收量做双重管制，若额度己面临用完的厂商，不得不面临被减量或是投资更昂贵的环保设备以符合标准。使得许多企业提早寻找替代生产基地，如东南亚及大陆内陆等等。目前仍有扩建空间的企业，大致上也都会在<span lang="EN-US">2009</span>年用完其额度，使得未来<span lang="EN-US">PCB</span>企业如何在法令限制中寻求新的发展，倍受瞩目</font></p> <p style="BACKGROUND: #fcfcfc; MARGIN: 0cm 5.75pt 0pt; TEXT-INDENT: 24pt; LINE-HEIGHT: 18pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt"><span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol"><span style="mso-list: Ignore">·<span style="FONT: 7pt 'Times New Roman'"> </span></span></span><font face="宋体">。新企业所得税制<span lang="EN-US">2008</span>年<span lang="EN-US">1</span>月<span lang="EN-US">1</span>日施行的企业所得税新制度中规定，新建企业所得税目标，就是要将内外资企业所得税统一为<span lang="EN-US">25</span>％，大多数<span lang="EN-US">PCB</span>厂商过去没厂均设于高新技术园区内，且享有高新技术认定，所以均享有税率优惠，大多数厂商税率均为<span lang="EN-US">15</span>％，且享有二免三减半。对于新建企业所得税的施行，政府虽然给予老企业缓冲时间，其采用逐年上调的方式，级距分别为<span lang="EN-US">2008</span>年税率<span lang="EN-US">18</span>％、<span lang="EN-US">2009</span>年税率<span lang="EN-US">20</span>％、<span lang="EN-US">2010</span>年税率<span lang="EN-US">22</span>％、<span lang="EN-US">2011</span>年税率<span lang="EN-US">24</span>％、<span lang="EN-US">2012</span>年税率<span lang="EN-US">25</span>％。但<span lang="EN-US">2007</span>年<span lang="EN-US">3</span>月后新进入建厂的企业则适用<span lang="EN-US">25</span>％的企业所得税规定。因此税率的变动也影响了净利水平。<span lang="EN-US">&nbsp;&nbsp;</span></font></p>http://www.sichinamag.com/blog/pcbsxl5/30685/message.aspx 显示光电（FPD）Fri, 22 Aug 2008 12:02:29 GMThttp://www.sichinamag.com/blog/pcbsxl5/30684/message.aspx<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align="center"><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 14pt; mso-bidi-font-size: 10.0pt"><a href="http://www.pcbinf.com/">PCB<span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">设计</span></span></a></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt">经验谈</span></b></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这是个牵涉面大的问题。抛开其它因素，仅就</span><span lang="EN-US"><a href="http://www.lrpcb.cn/">PCB<span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">设计</span></span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">环节来说，我有以下几点体会，供参考：</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　</span><span lang="EN-US">1.</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">要有合理的走向：如输入</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">输出，交流</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">直流，强</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弱信号，高频</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">低频，高压</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">低压等</span><span lang="EN-US">...</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，它们的走向应该是呈线形的</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或分离</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不得相互交融。其目的是防止相互干扰。最好的走向是按直线，但一般不易实现，最不利的走向是环形，所幸的是可以设隔离带来改善。对于是直流，小信号，低电压</span><span lang="EN-US"><a href="http://pcbsxl2.studentboss.com/">PCB<span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">设计</span></span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的要求可以低些。所以</span><span lang="EN-US">"</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">合理</span><span lang="EN-US">"</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是相对的。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　</span><span lang="EN-US">2.</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选择好接地点：小小的接地点不知有多少工程技术人员对它做过多少论述，足见其重要性。一般情况下要求共点地，如：前向放大器的多条地线应汇合后再与干线地相连等</span><span lang="EN-US">...</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。现实中，因受各种限制很难完全办到，但应尽力遵循。这个问题在实际中是相当灵活的。每个人都有自己的一套解决方案。如能针对具体的电路板来解释就容易理解。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　</span><span lang="EN-US">3.</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">合理布置电源滤波</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦电容：一般在原理图中仅画出若干电源滤波</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦电容，但未指出它们各自应接于何处。其实这些电容是为开关器件</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">门电路</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或其它需要滤波</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦的件而设置的，布置这些电容就应尽量靠近这些元部件，离得太远就没有作用了。有趣的，当电源滤波</span><span lang="EN-US">/</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦电容布置的合理时，接地点的问题就显得不那么明显。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　</span><span lang="EN-US">4.</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">线条有讲究：有条件做宽的线决不做细；高压及高频线应园滑，不得有尖锐的倒角，拐弯也不得采用直角。地线应尽量宽，最好使用大面积敷铜，这对接地点问题有相当的改善。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　</span><span lang="EN-US">5.</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有些问题虽然发生在后期制作中，但却是</span><span lang="EN-US"><a href="http://pcbsxl2.woku.com/">PCB<span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">设计</span></span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中带来的，它们是：</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　过线孔太多，沉铜工艺稍有不慎就会埋下隐患。所以，设计中应尽量减少过线孔。同向并行的线条密度太大，焊接时很容易连成一片。所以，线密度应视焊接工艺的水平来确定。焊点的距离太小，不利于人工焊接，只能以降低工效来解决焊接质量。否则将留下隐患。所以，焊点的最小距离的确定应综合考虑焊接人员的素质和工效。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　焊盘或过线孔尺寸太小，或焊盘尺寸与钻孔尺寸配合不当。前者对人工钻孔不利，后对数控钻孔不利。容易将焊盘钻成</span><span lang="EN-US">"c"</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">形，重则钻掉焊盘。</span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">导线太细，而大面积的未布线区又没有设置敷铜，容易造成腐蚀不均匀。即当未布线区腐蚀完后，细导线很有可能腐蚀过头，或似断非断，或完全断。所以，设置敷铜的作用不仅仅是增大地线面积和抗干。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　以上诸多因素都会对电路板的质量和将来产品的可靠性大打折扣。</span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>http://www.sichinamag.com/blog/pcbsxl5/30684/message.aspx 显示光电（FPD）Fri, 22 Aug 2008 12:02:01 GMThttp://www.sichinamag.com/blog/pcbsxl5/30683/message.aspx<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align="center"><b style="mso-bidi-font-weight: normal"><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通用加密方法</span></b><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 15pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></b></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">加密方法其实不外以下几种</span><span lang="EN-US" style="FONT-SIZE: 9pt">:<o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt">1</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、增加一颗比较难</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://www.pcb-ic.com/"><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">解密的芯片</span></span></a></span></b><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如</span><span lang="EN-US" style="FONT-SIZE: 9pt">CPLD</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作上加密算法</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br>&nbsp;&nbsp; </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法也挺理想</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">缺点就是增加了开发</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">生产成本</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但同时也提高了他人的解密难度和成本</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br>2</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、磨掉型号</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">打上一些闻所未闻的标记</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">同时隐蔵震荡电路及复位电路</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法能起一定作用</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但并不绝对</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因为它对开</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://www.dmpcb.cn/"><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">芯</span></span><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">片解密</span></span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的人不起作用</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">外部环境可以隐藏</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可硅片上的标志</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">桂片结构却无法隐藏</span><span lang="EN-US" style="FONT-SIZE: 9pt">. </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法的最高境界就是以裸片邦定</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不以常规方式出脚</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">故意将</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://pcbsxl2.blog.zj.com/"><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">芯片</span></span><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">解密者</span></span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引入歧途</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但这种方法难在裸片难找</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不用急</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我司可提供大量不同公司裸片</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并协助你完成加密工作</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-SIZE: 9pt">3</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、作为加密方法</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我个人认为</span><span lang="EN-US" style="FONT-SIZE: 9pt">:</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">芯片制造厂家有很大关系</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若</span><span lang="EN-US" style="FONT-SIZE: 9pt">:</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">芯片制造厂家不公布</span><span lang="EN-US" style="FONT-SIZE: 9pt">IC</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的读时序</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">那解密者可就得抓破头皮了</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法其实有家厂使用了</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">他生产的芯片内部实际是</span><span lang="EN-US" style="FONT-SIZE: 9pt">EPROM,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可解密者拿它一点办法都没有</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因为无法得到</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://pcbsxl2.niwota.com/"><span style="COLOR: black; TEXT-DECORATION: none; text-underline: none">IC</span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的读时序</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br>4</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、烧坏芯片不用资源</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">使人无法完成</span><span lang="EN-US" style="FONT-SIZE: 9pt">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">读</span><span lang="EN-US" style="FONT-SIZE: 9pt">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">操作</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法技高一筹</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">使</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://space.scol.com.cn/pcbsxl2/"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">芯片</span></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">解密</span></span><span lang="EN-US" style="FONT-WEIGHT: normal; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">者</span></span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">麻烦一些</span><span lang="EN-US" style="FONT-SIZE: 9pt">. </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法常见的有两种</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一种烧断邦定线</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">另一种则为烧坏输出缓存器</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若是这样</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解密者须借助价格昂贵的仪器</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因此需增加<b style="mso-bidi-font-weight: normal"><span style="COLOR: black">芯片解密费用</span></b></span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">也变向的增加了解密难度</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br>5</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、作掩膜</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属上具有公司特色的代号</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方法是最完美的加密方法</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但价格昂贵</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">故只有拥有雄厚财力</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并有远大眼见的人才可使用</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br>6</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、本公司研究出一种新的加密方法</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可使廉价单片机几乎无法解密</span><span lang="EN-US" style="FONT-SIZE: 9pt">.<br></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以上是本人对加密的一点浅见</span><span lang="EN-US" style="FONT-SIZE: 9pt">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">希望大家指教</span><span lang="EN-US" style="FONT-SIZE: 9pt">.</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">留下你的真知灼见</span><span lang="EN-US" style="FONT-SIZE: 9pt"><o:p></o:p></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">龙人计算机深圳分公司的</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://inc.bosslink.com/pcbsxl2"><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">芯片</span></span><span style="COLOR: black; TEXT-DECORATION: none; text-underline: none">IC</span><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">解密事业部</span></span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">专门为客户提供<span style="COLOR: black">芯片解密</span>、</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://www.pcb-ic.com/"><span style="COLOR: black; TEXT-DECORATION: none; text-underline: none">IC</span><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">解密</span></span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、单片机解密</span><span lang="EN-US" style="FONT-SIZE: 9pt">(MCU</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解密</span><span lang="EN-US" style="FONT-SIZE: 9pt">)</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black"><a href="http://pcbsxl2.cublog.cn/"><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体; TEXT-DECORATION: none; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; text-underline: none"><span lang="EN-US">软件破解</span></span></a></span></b><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等服务。详情：</span><b style="mso-bidi-font-weight: normal"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: black">http://www.pcbinf.com<o:p></o:p></span></b></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>http://www.sichinamag.com/blog/pcbsxl5/30683/message.aspx IC设计与软件