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</div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_148546"> 用投影仪自制彩色投影机又一例 2001年,第19期,类别:<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>制作 </P> 自从２０００年《电子报》第２４期刊出自制彩投的文章后，引起了笔者的兴趣。终于下决心邮购回一台１４ｃｍ（５．６英寸）小彩电。该机有ＡＶ输入，全增补频道电视接收，经过一段时间的打造，终于制成了一台经济实用的彩投。下面就制作中的一些体会介绍给广大爱好朋友。 一、改制彩投后的主观评价 虽然１４ｃｍ（５．６英寸）彩屏清晰度不尽人意，但改制后效果不错，很吸引人。朋友观后评价：图像色彩还原正常，无几何失真，由于采用最新型书写投影仪作光源，所以画面亮度均匀，边角与中心都很清晰。总体感觉图像效果接近商品彩投，胜过早期彩投。将这台机子在校内晚会播放，配合专业音响与２０３ｃｍ（８０英寸）的玻璃微珠幕，在８００余名师生中产生了震撼效果，深受好评。这台投影仪亮度较高，最佳区域为６０°的５～１５米扇形区域。 二、改制彩投的措施 １． 提高光的利用率：投影仪台面是２０ｃｍ×２０ｃｍ或２５ｃｍ×２５ｃｍ，而１４ｃｍ（５．６英寸）ＴＦＴ的面积仅１２ｃｍ×１０ｃｍ，有７０％以上的光损耗了。为此，笔者在投影仪内的菲涅尔透镜下，用铝板做成了一个光的集中通道，其截面约１２．５ｃｍ×１０．５ｃｍ如图１。光通道略大于彩屏。改进后主观感觉光照亮度提高２０％至３０％。 ２． 散热处理：使用三层玻璃隔热，然而放映不过半小时，一块８ｍｍ和５ｍｍ厚度的玻璃先后烤裂。而３ｍｍ的薄片反而未裂，于是找来四块１８ｃｍ×１２ｃｍ的３ｍｍ玻璃片，经反复试验，装入一个框内，如图２，做成一个隔热器。在其侧面安一个用电动剃须刀电机改成的风扇强制散热。通过以上措施改制后，放映数小时，彩屏也不发烫，散热器也不热（编者注：散热处理若采用专用隔热玻璃，光亮损失要小一些，效果更好）。 ３． 注意事项：液晶彩电改制投影机时，取彩屏应特别小心，不要弄断驱动板上的信号线，不要弄花彩屏，彩屏双面最好用透明幻灯（塑料）片包起来，处理后的彩屏与原机壳最好固化为一体。 ?四川 陈代明 </P></td></tr></table> </div> <div id="comment_148546" class="cm"> </div> <div id="post_rate_div_148546"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=20288&formhash=71128307" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber" style="display:none">0</span></i></a> <a class="followp" href="home.php?mod=spacecp&ac=follow&op=relay&tid=20288&from=forum" onclick="showWindow('relaythread', this.href, 'get', 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