轻小型广角投影物镜的设计

Design of Light Weight Small Wide-angle Projection Lens

为实现数字投影机的小型化和轻量化,设计了一款适用于0.55inch数字微反射镜芯片的小型广角投影物镜.该投影物镜总长69mm,全口径25mm,由5片玻璃透镜,2片塑料透镜(4个非球面)组成.系统采用像方远心的反远距结构形式,用Zemax软件实现优化设计.F数为F/2.4,投射比为0.73∶1,即60cm处可投射出40inch的画面,全视场畸变低于1%,在极限空间频率66lp/mm处,中心视场光学传函达到0.75,边缘视场光学传函达到0.42.该镜头具有小口径、大视场、低成本、结构简单和易加工等优点.

To realize the miniaturization and light weight of the digital projector,a wide-field angle mini lens for 0.55 inch DLP was designed.The total length is 69 mm,the full aperture is 25 mm,and it is composed of five glass lenses and two plastic lenses（4 aspheric surfaces）.The lens used an inverted telephoto structure,with ZEMAX software as the optimize tool.Its F-number is F/2.4,the projection ratio is 0.73∶1,and it can project a 40 inch picture from 60 cm away.The distortion of the full field is less than 1%.Its image quality is excellent that the MTF of center field is 0.75,and the MTF of 1.0 field is 0.42,with advantages of small size,light weight,low cost,simple structure and easy process.