折/衍混合远心消色差f-θ物镜系统设计  

Design of A Hybrid Diffractive/Refractive Achromatized Telecentric F-θ Lens System

作　　者：吴环宝[1] 王肇圻[1] 傅汝廉[1] 

机构地区：[1]南开大学现代光学研究所

出　　处：《光子学报》2005年第12期1818-1821,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(编号60277021)资助项目

摘　　要：设计了一个折/衍混合远心消色差fθ物镜系统.该系统由一片折射/衍射透镜和三片折射透镜组成.入瞳位于系统前焦面,整个系统满足像方远心.与美国专利(专利号:4,925,279)相比较,垂轴色差由2.40mm降到0.23mm,降低了一个数量级;对于0°、14°和20°视场,最大垂轴像差分别由260μm、1350μm、2090μm降低到5μm、250μm、318μm,最大场曲分别由8mm、10mm、13mm降低到0.5mm、1mm、6mm.该物镜不仅可用于彩色激光打印机、激光数码彩扩等多波长的扫描系统,也可用于能量要求较高的扫描系统.在高能量扫描系统中,通过引用折/衍混合远心消色差fθ物镜,可用小体积工作于多纵模状态的激光器代替大体积单波长的激光器,使整个扫描系统小型化,并且提高了扫描准确度.A hybrid diffractive/refractive achromatized telecentric f-θ lens system had been designed with a hybrid diffractive/refractive lens and three refractive lenses. The entrance pupil was placed at the focal plane so that it was a telecentric system. Contrast to the US patent 4,925,279, the lateral color reduced by one-order in magnitude（from 2.40 mm to 0.23 mm） ,and the maximal transverse aberration reduced from 260 μm. 1350 μm.2090 μm to 5 μm.250 μm.318 μm for 0°.14° and 20° field of views, and the maximal field curvature reduced from 8 mm、 10 mm、 13 mm to 0. 5 mm、 1 mm、 6 mm for the aforementioned field of views. The designed lens f-θ system could be applied in color scanning systems, such as color laser printers and color digital photo printers. It could also be applied in high energy scanning systems. When applying the designed hybrid diffractive/refractive achromatized telecentric f-θ lens system to the high energy scanning system, a big laser machine operating in one longitudinal mode could be replaced by a small multi-mode operating laser machine, and the system could be simplified greatly and the accuracy could be proved.

关 键 词：f-θ物镜 远心 折/衍混合系统 光学设计 

分 类 号：TH74[机械工程—光学工程]