摘要
为了提高同心透镜的轴外视场照度,通过在同心透镜内部设置一个基于全内反射的虚拟光阑,可使系统的能量分布更加均匀,进而改善同心透镜的成像性能。结合虚拟光阑的建立条件以及手机镜头要求,计算了一个基于反射式同心透镜手机镜头的初始结构,优化后的系统焦距2.7 mm,最大视场角±50°,系统F数1.8,总长2.7 mm。照度分析结果表明,利用传统孔径光阑的手机镜头相对照度随视场增大逐渐下降,最大视场仅为0.64;采用虚拟光阑的手机镜头在0°~28°视场的相对照度保持不变,全视场的相对照度在0.85以上。可见,采用虚拟光阑的手机镜头全视场照度的均匀性得到了明显改善,可有效提高系统的成像性能。
Objective Enlarging the field of view of an optical system while maintaining good imaging quality is a difficult problem in modern optical design.The large field of view and high resolution of optical lenses are mutually restricted,and it is generally difficult to realize them at the same time.It requires complex structure design,expensive manufacturing,and large volume.Each surface of the monocentric lens is monocentric,and the curved imaging plane is also monocentric with each surface.The special structure enables it to achieve a large field of view and high resolution.It also has the advantages of simple structure,small size,and light weight.It is widely used in aerial remote sensing,security monitoring,photography,videography and so on,and may be first applied in miniaturized mobile phone lenses in the future.However,because the monocentric lens sets a conventional stop in the center to block the light beam of the off-axis field of view,when the field of view is larger,more light will be blocked,which causes greater vignetting,reduces the uniformity of illumination of the imaging plane,and affects the imaging quality.In order to improve the relative illuminance of the monocentric lens,a monocentric reflective mobile phone lens that uses a total reflection surface to control the light beam is designed.Methods A monocentric reflective mobile phone lens structure is designed in this paper.The initial structure is obtained by calculating the optical path of two reflective monocentric lenses(Fig.4).The optimized structure consists of a meniscus lens and a hemispherical lens,which are glued together using a low-refractive-index cement(Fig.5(a)).The spot for different fields of view of monocentric reflective lenses using conventional stop and virtual stop are simulated(Fig.6,Fig.8).Under different stop conditions,the relative illuminance curves of monocentric reflective lens are drawn(Fig.9).Results and Discussions The designed monocentric reflective mobile phone lens has a focal length of 2.7 mm,a maximum field of
作者
李若兰
王洋
徐乾智
张磊
付跃刚
Li Ruolan;Wang Yang;Xu Qianzhi;Zhang Lei;Fu Yuegang(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;Military Representative Office of Shenyang Regional Military Representative Bureau of Army Armament Department in Changchun Region,Changchun 130000,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第5期257-263,共7页
Infrared and Laser Engineering
基金
吉林省科技发展计划项目优秀青年人才基金(20190103046JH)。
关键词
光学设计
虚拟光阑
相对照度
同心透镜
反射式
渐晕
optical design
virtual stop
relative illuminance
monocentric lens
reflective type
vignetting
