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onload="javascript:if(this.width>600)this.width=600;"></p><p>照片<br/></p><p><img src="data/attachment/forum/dvbbs/2006-7/200672111112344573.jpg" onload="javascript:if(this.width>600)this.width=600;"></p><p><br/></p><p><img src="data/attachment/forum/dvbbs/2006-7/200672111115830813.jpg" onload="javascript:if(this.width>600)this.width=600;"></p><p><br/><img src="data/attachment/forum/dvbbs/2006-7/200672111121655917.jpg" onload="javascript:if(this.width>600)this.width=600;"><br/></p><p>希望各位帮忙分析。</p><br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> 是不是系统本身的问题？<br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> <p>您所指的系统是镜头本身还是相机?</p><br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> <p>相机，因为看上去左右比上下衰减得更利害，可能是sensor前面有光栏</p><br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><br /> <br /> <p>把最后试场的角度设大一些,看看光线能否通过,然后看其相对照度如何,说不定是你实际所拍摄的角度大于你0.9试场的角度,有时候在边缘附近,角度稍微增大一点,相对照度减小很多，当然,这是我的理论分析</p><br /> <br /> <br /> <br /> <br /> </div> <div class="postmsg"><p>镜片３个都为塑料，现发现模芯光洁度不太好，且三个镜均没有镀膜，未知是否就是问题所在？</p></div> <div class="postmsg"><p>通过调节相机的S/W Driver, 已经得到很好的改善</p><img src="data/attachment/forum/dvbbs/2006-8/200682116523447552.jpg" onload="javascript:if(this.width>600)this.width=600;"><br/></div> <div class="postmsg">可是还是有啊，软件补偿治标不治本。</div> <div class="postmsg"><p>其实任何镜头肯定都是边缘照度低于中心照度的,就看是否可以接受的一个度的问题.</p></div> <div class="postmsg"><p>三个镜片都没有镀膜的话有近25%左右光通量损失,0.9视场如有70%相对照度,相对而言比较低,如果你的设计视场正好与CMOS感光面积相同,则边缘的相对照度比这个还少.在低光能量下可能导致边缘正好处在CMOS阈值附近,我感觉上两张照片整体都比较暗,而下面一张则比较亮,如有可能建议都镀上膜再试试.</p></div> <div class="postmsg">可能你的CRA大了，看起来有30多度了。</div> <div class="postmsg"><p>补充一点,入射角(指光线对每一个镜面)过大,会增加反射,从而使边缘变暗,你可以去看看PHOTONICS 2006/7里面有文章说明</p></div> <div class="postmsg">楼上的从MTF上看是没有什么,公差分析做了吗?重新把公差分析做一下才是最能说明的</div> <div class="postmsg"><p>边缘光纤入射角过大，反射损失肯定远大于中心的。而且根据cos的四次方关系。边缘视场也很低的照度、</p><p>可以把边缘设计成像方远心结构，让主光纤在各镜片入射角变小。较少光能损失。</p><p>还可以增大边缘视场像方孔径角，破坏cos四次方的规律。我设计大视场镜头的时候，故意增大边缘像方孔径角的。甚至接近远心结构，来保证边缘照度。结果边缘的能达到中心视场的98％照度，甚至超过100％。最大半视场40度</p></div> <div class="postmsg"><p>1.没有镀膜，画面整体偏暗</p><p>2.入射角过大或过小，一般是过大引起sensor的受光不均。</p><p>3.有R非常小的面，而且没有镀膜，也没有其他处理。</p></div> <div class="postmsg">现有一机会，让我重做该镜头来改进之前的缺陷，之前边缘照度不足的问题，真正的原因还不确定，现在总结如下：<br/><div>1. 边缘区域光线的出射角度太大，使到达像素感应区的光线不够，导致CMOS感光不足。但是，我见过有一些设计，其最大出射角也有20多度甚至达到30度，但使用并未出现这么严重的照度不足问题，不解！难道是我们使用的CMOS不同？总之，降低边缘光线的出射角度，肯定是对照度提高有帮助的。<br/>2. IR滤光片放置在镜头最前面，一台湾朋友说这样会将光线聚集到中心区域，使得边缘变暗。想想这个好象并无道理，但我这次还是将它放到后面去了。实际上我也试过放后面去拍照对比，并没有实质改善。<br/>3. 这个镜片的分布结构不行，有较小的球面半径（最小R1.1），使得光线在有些面上的入射角过大。<br/>4. 镜片都没有镀膜。这是一低档产品上使用，价格较低，产量较大，公司不允许镀膜以降低成本。<br/><br/> 新做的如图，<font face="Arial">与原镜头相比，主要区别是降低了光线的chief ray angle（对比见PDF文档）和将IR滤光片放置在sensor前。<br/> <br/> 不知这次能否成功，希望各位能不吝赐教，给予宝贵意见，在此先谢了。<br/></font><font face="Arial" size="2"></font></div></div> <div class="postmsg"><p><br/></p><p></p><p>怎么发帖时总要我重新登陆。</p></div> <div class="postmsg">""""我设计大视场镜头的时候，故意增大边缘像方孔径角的。甚至接近远心结构，来保证边缘照度""<br /> 请问,增大像方孔径角 甚至接近像方远心 是接近的关系,还是背离的关系?我怎么觉得增大孔径角是越来越不是远心结构呢.</div> <div class="postmsg">Sensor表面边缘光线入射角太少所至,建议从设计上改,不然较难推向市场.</div> <div style="height200px;"></div> <ul class="xl xl2 cl" style="border-top: 1px #cccccc dashed;margin:5px 0 ;padding-top:5px"> <dl><b> 同一主题资料:</b></dl> <dl style="margin:10px 1px;display:inline"><a href="attachcenter-page.html?aid=9056" title="hRfjQVVX.jpg"><img src="data/attachment/forum/dvbbs/2006-7/20067211182793994.jpg" 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