大视场大相对孔径水下专用摄影物镜的设计

分析了大视场大相对孔径水下专用摄影物镜的设计特点.基于反摄远结构引入一个高次非球面设计了相对孔径为1/1.4,水下全视场66°,焦距11.85 mm,光谱响应范围0.48～0.60 μm,采用平面水密壳窗的水下专用摄影物镜.全视场MTF在空间频率42 lp/mm时高于0.4.与相同技术要求下全部采用球面透镜的设计进行比较,表明该摄影物镜结构更简单,成像质量也更优异,能够满足深水微光摄影物镜对大视场、大相对孔径、小型化、轻量化的需求.

Design for Special Underwater Photography Objective Lens with Wide Angle and Large Relative Aperture

The characteristics of design for special underwater photography objective lens with wide angle and large relative aperture are analyzed.Based on reverse–telephoto structure with a high order aspheric surface and flat waterproof interface,an underwater photography objective,which the relative aperture is 1/1.4,field of view in underwater is 66°,focal length is 11.85 mm,and spectrum bandwidth is from 0.48 to 0.60 μm ,is designed.The MTF of the whole field of view at 42 lp/mm is greater than 0.4.Compared with the lens all with spherical surface at the same specification,this photography objective lens is simpler in structure but better in imaging quality,and it can meet the requirements of wide angle,large relative aperture,miniaturization and light weight for weak illumination photography objective lens in deep water.