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class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tbody><tr><td class="t_f" id="postmessage_76099"> 背投彩电大屏幕（菲涅尔透镜）<a href="http://theory.oecr.com" target="_blank" class="relatedlink">资料</a>介绍(www.bhlens.com) <br> 1、背投原理：背投指投影设备置于屏幕之后，直接朝向观众投影。光学屏幕可控制光线路径并将明亮清晰的图像投至预先确定的观视范围。此外，演示者和观众站在图像前面不会留下暗影。再加上投影仪器隐藏在屏幕背面，使观视范围保持安静、整洁及清晰。<br> <br> 2、菲涅耳透镜及柱状透镜光学原理：<br> 靠投影机一侧的高精度菲涅耳透镜有聚光镜的功能：汇聚投影光线并将其以正确的角度传送至屏幕。丙烯酸屏幕上的漫射物质控制垂直光线的分布，屏幕正面良好的点距双凸镜可将高分辨率图像分布在180°水平视角范围上。 <br> 目前背投屏幕有三种：<br> 第一种：前面有柱状透镜，后面有菲涅耳透镜。这种是第一流的光学背投屏幕；<br> 第二种：后面有菲涅耳透镜，而前面无柱状透镜，靠点状来实现。这种屏幕比第一种要差；<br> 第三种：前后都无透镜。这种屏幕很差，不属于光学屏幕的范畴。<br> DNP屏幕有双层透镜光学结构，属于第一种屏幕。<br> <br> 3、屏幕的焦距（Focal Length）:<br> 屏 幕 焦 距 与 投 影 机 镜 头 的 关 系 等于Focal length时，屏幕图象的亮度非常均匀。 大于屏幕的Focal length时光线将会变窄，图像的最亮的部分会在屏幕角上。 <br> 为实现图像在屏幕上完美的再现, DNP光学系列背投屏幕每一规格都有3~4种不同的焦距!可覆盖各种投影机的不同镜头! <br> 屏幕的Focal length 指屏幕与它最近的一个焦点的距离。<br> 正确的安装是投影射距离与屏幕的焦距相匹配，最好在-5%~+10%之间<br> <br> 4、背投屏幕的<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>：光学背投幕的制作材料是由光学级Acrylic（丙烯酸）树脂组成。DNP的屏幕在材料中加入了特殊的灰滤光素，实现了其高对比度。 <br> 拥有4x3米的巨型图像面积,使dnp的巨型广角屏幕成为了广告和公共娱乐场所的理想宣传工具 <br> Dnp d200巨型广角屏幕是28电视屏幕的50倍. <br> Dnp巨型广角屏幕提供相当于视频墙的尺寸却不造成因拼接而发生的图像缝隙. <br> Dnp的200巨型广角屏幕,是全世界最大的专业光学背投屏幕. <br> Dnp巨型广角屏幕所投影的图像面积可达3X4米之大,单一面屏幕就相当于40视频墙5X5立方的总面积.它的超阶级大尺寸、宽视角以及高质素的图像表现,使之成为向大众提供高品质投影视频、幻灯及计算机图像的最佳之选.其应用范围包括:<br> 大型会议室 展览馆及礼堂 体育馆 超级市场 机场、车站、码头 音乐厅 <br> 巨型广角屏幕可在所有室内环境下使用----包括在光亮的房间内.无论是作为部份镶嵌安装方案或是大型背投箱,背后投影装置的原理令演讲者与观众,即使站在投像前面也不造成暗影.再加上投影机设备都隐藏在屏幕后面,从而使观视范围保持安静、整洁及清晰. <br> <br> Dnp----屏幕的艺术<br> Dnp光学屏幕的技术提供比传统式前投或后投屏幕清晰4倍的图像.除巨型广角屏幕之外,dnp还有其他各种规格的光学背投屏幕,如:黑条纹屏幕、图型屏幕、广角屏幕、新广角屏幕、超对比度屏幕以及视频墙等.而近年还在市场上推出全新的BB屏(黑珠光学背投屏幕)和Holo屏(透明<a href="http://holographic.oecr.com" target="_blank" class="relatedlink">全息</a>屏幕),以满足各地客户的要求及提供多项选择给客户.<br> <br> 光学原理 <br> Dnp巨型广角屏幕是由两面透镜而组成的单元素光学系统.<br> 在面向着投影机一方的菲涅尔透镜有凝聚作用.它将投影光线聚合,再将光线角度垂直地投送到屏幕前方.而投射在丙烯酸屏内的散发性的物质能控制垂直光线的发放. 另一方面在前方垂直立体透镜会捕捉光线并将之传送到广阔的观视范围.<br> <br> 光学特性 <br> Dnp巨型广角屏幕是为了向广大观众展示投影图像而特别设计的,它能够在广阔的视觉范围提供逼真而清晰的图像.<br> 高度精密的菲涅尔立体透镜系统能很好地兼容周围的光线.<br> <br> 优点<br> 光学菲涅尔透镜系统<br> 高亮度图像 <br> 屏幕尺寸:140~200<br> 140~180另有16:9规格的宽屏幕<br> <br> 应用<br> 视频、计算机及幻灯片<br> 演示、视频以及广告方案<br> 镶嵌系统或大型背投箱<br> 适合于CRT、LCD、DLP、幻灯及光阀投影机<br> <br> 欢迎光顾波海光电网 www.bhlens.com <br> 无锡波海光电是国内少数几家能生产大型菲涅尔透镜（直径1000mm~2000mm)的<a href="http://b.oecr.com/company" target="_blank" class="relatedlink">企业</a>之一.<br> <br> qq:157891017<br> mail:webmaster@lenssalon.com<br> <br> </td></tr></tbody></table> </div> <div id="comment_76099" class="cm"> </div> <div id="post_rate_div_76099"></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=8689&formhash=1b0af445" 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 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