微投影广角镜头设计

为了满足国内外视场投影仪微型轻量化的趋势，设计一款适用于德州仪器推出的1.19 cm (0.47 英寸)、1080 pix数字微反射镜片的微型广角投影镜头。镜头由7片玻璃（均为国内常见玻璃）和2片塑料（4面非球面）透镜组成，结构简单，易加工。透射比0.66:1，即在600 mm处投影出111.76 cm(44 英寸)的画面，镜头有效焦距6.45 mm，F#:2.1，全视场86，系统总长46 mm，最大口径22 mm，在空间极限频率93 lp/mm处0.8视场以内传递函数值都超过0.62，边缘视场的传递函数值超过0.43，全视场畸变小于等于2%，垂直色差小于等于0.18 m。

Design of mini projection wide angle lens

In order to meet the requirement of the miniaturization and light weight for field projector both at home and abroad,we designed a short focal digital projection lens for the 1.19 cm (0.47 inch),1080 pixel digital micro mirror device (DMD) chip from TI.It is composed of 7 glass lenses (all common glass) and 2 plastic lenses (4 aspheric surface) with simple structure,and is easy to process.The projection ratio is 0.66:1 and it can project a 111.76 cm (44 inch) picture at the distance of 600 mm. The effect focal lenth is 6.4 mm,the F number is:F/2.1,the full field of view(FOV) is 86,the total length is 46mm,the full aperture is 22 mm,the modulation transfer function (MTF) is more than 0.62 at the spatial frequency of 93 lp/mm within 0.8 FOV, the MTF of 1 field is 0.43,the distorition of the full FOV is less than 2%, and the vertical chromatic aberration is less than 0.18 m.