【摘要】：超短焦投影技術(shù)是近年來興起的一項(xiàng)新型投影顯示技術(shù),其特點(diǎn)是能在很短的投影距離下實(shí)現(xiàn)大畫面的顯示效果,由于工作距離很短,幾乎靠近投影幕布,極大的節(jié)約了使用空間,同時(shí)克服了普通投影機(jī)工作時(shí)強(qiáng)光容易直射人眼的問題,也完美地解決了講演者站在投影機(jī)和屏幕之間時(shí)會(huì)產(chǎn)生陰影遮擋的問題,增加了自由活動(dòng)空間,提升了教學(xué)、演講和展示的互動(dòng)性。這種新型投影技術(shù)的實(shí)現(xiàn)主要依賴于經(jīng)過特殊光學(xué)設(shè)計(jì)的投影物鏡,前人在這種超短焦鏡頭的設(shè)計(jì)上做過很多相關(guān)的研究與實(shí)踐,在此基礎(chǔ)上本文采用離軸折反式的成像光學(xué)系統(tǒng)設(shè)計(jì)方法,成功設(shè)計(jì)了一款折反式超短焦投影鏡頭。論文首先介紹了傳統(tǒng)的共軸成像系統(tǒng)在大視場、超短焦投影成像上所表現(xiàn)出來的問題和局限性,基于此提出了本文所采用的折反式離軸成像系統(tǒng)設(shè)計(jì)理論,從原理上分析了這種結(jié)構(gòu)在大視場的情況下解決畸變校正、垂軸色差和場曲控制的問題。隨后針對(duì)本文所要設(shè)計(jì)鏡頭的各項(xiàng)參數(shù)目標(biāo),選取了合適的初始結(jié)構(gòu),在設(shè)計(jì)原理所體現(xiàn)出的優(yōu)化思想下,經(jīng)過大量的修改、調(diào)整和優(yōu)化,最終得出符合要求的設(shè)計(jì)結(jié)果。之后對(duì)所設(shè)計(jì)的鏡頭系統(tǒng)做了詳細(xì)的公差分析,結(jié)果表明公差性能優(yōu)越、良品率高,同時(shí)利用該分析結(jié)果確定了系統(tǒng)光機(jī)設(shè)計(jì)的公差要求。最后,在完成光機(jī)設(shè)計(jì)之后,本文加工和裝配了一套實(shí)驗(yàn)樣機(jī)系統(tǒng),經(jīng)過幾輪反復(fù)的調(diào)試得到滿意像質(zhì)的投影畫面,隨后對(duì)鏡頭做了成像清晰度評(píng)價(jià)、畸變與色差評(píng)價(jià)以及投射比和放大率計(jì)算,各項(xiàng)評(píng)價(jià)結(jié)果表明所設(shè)計(jì)的折反式超短焦投影鏡頭較好的完成了設(shè)計(jì)目標(biāo)要求,其中投射比大小為0.3,視場角達(dá)到150。F數(shù)為2.6。鏡頭結(jié)構(gòu)簡單緊湊,折射鏡組部分僅含有13片透鏡,只使用到1片非球面透鏡和1片凹面非球面反射鏡。
[Abstract]:Ultra-short focus projection technology is a new projection display technology developed in recent years. Its characteristic is that it can realize the display effect of large picture at very short projection distance, because the working distance is very short, it is almost close to the projection curtain. Greatly saves the use space, at the same time overcomes the common projector to work the strong light easy to shoot the human eye question, also has solved perfectly the speaker standing between the projector and the screen will produce the shadow to block the problem, Increases the free movement space, enhances the teaching, the speech and the display interactivity. The realization of this new projection technology mainly depends on the projection objective lens with special optical design. The predecessors have done a lot of relevant research and practice in the design of the ultra-short focus lens. On the basis of this, an off-axis reflexive imaging optical system design method is used to successfully design a reflexive ultra-short focus projection lens. This paper first introduces the problems and limitations of the traditional coaxial imaging system in large field of view and ultrashort focus projection imaging. Based on this, the design theory of the reflexive off-axis imaging system is proposed. In principle, the problems of distortion correction, vertical axis chromatic aberration and field curvature control are analyzed in the case of large field of view. Then according to the parameters of the lens to be designed in this paper, select the appropriate initial structure, under the optimization thought reflected in the design principle, after a lot of modification, adjustment and optimization, finally get the design results that meet the requirements. The tolerance analysis of the designed lens system shows that the tolerance performance is superior and the good product rate is high. At the same time, the tolerance requirements of the system optical machine design are determined by the result of the analysis. Finally, after finishing the optical machine design, this paper processes and assembles a set of experimental prototype system, after several rounds of repeated debugging to obtain a satisfactory image quality of the projection screen, and then the lens image definition evaluation. The evaluation results of distortion and color difference, projection ratio and magnification show that the designed reflexive ultrashort focus projection lens has achieved the design goal well, in which the projection ratio is 0.3, the field angle is 150.F and the number is 2.6. The lens structure is simple and compact, only 13 lenses are included in the refraction lens system, only one aspheric lens and one concave aspherical mirror are used.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH741.5

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本文編號(hào)：2213576