500万像素手机镜头设计

 利用ZEMAX光学工程设计软件，设计了一款500万像素的手机镜头。该镜头由4片塑料非球面透镜和1片红外滤光片组成，其光圈值F为2.85，视场2ω为60°，采用Aptina公司的一款500万像素7.94mm(1/3.2)英寸CMOS作为该镜头的图像传感器，该图像传感器的像素颗粒大小为1.75μm，截止频率为285lp/mm，即为奈奎斯特频率。设计结果显示，该镜头在奈奎斯特频率处，0.7视场以内的MTF值大于0.3，在奈奎斯特频率1/2处视场的MTF值均大于0.5，波前均方差(RMS wavefront error)小于0.1，畸变小于1%。

Design of lens for 5 mega-pixel mobile phone cameras

A mobile phone lens assembly composed of 4 plastic aspheric lenses and an IR filter was designed by use of ZEMAX (optical engineering software). Considering the production and cost，the plastic lens E48R was chosen．The 1/3.2 in (7.94mm) 5 mega-pixel CMOS made by Aptina is taken as the image sensor of the lens assembly，whose pixel size is 1.75μm and the limiting resolution is 285lp/mm. The F-number and FOV of the camera are 2.85 and 60° respectively. The results show that the lens has excellent imaging quality, the MTF value is more than 0.3 within 0.7 FOV at the Nyquist frequency, the MTF value of FOV are more than 0.5 at the 1/2 Nyquist frequency, wavefront mean square error is less than 0.1, and the distortion is less than 1％.