一款超薄800万像素手机镜头的设计

An ultra-thin eight-mega-pixel mobile phone lens

为了满足市场对超薄手机镜头的要求,运用光学软件CODEV,结合非球面理论,设计一款新的超薄800万像素手机镜头。该镜头由4片非球面塑料镜片,1片滤光镜片和1片保护玻璃组成,其中第1片透镜是正透镜,第2片镜片是负透镜,第3片镜片是正透镜,第4片镜片是负透镜,且光阑位于第1片透镜的前面。镜头光圈值F为2.4,视场角2ω为65.5°,焦距为3.731 5mm,后焦距0.31mm,镜头总长度为4.6mm,在最高频率1/2处大多数视场的MTF值均大于0.5,畸变小于2%。

The ultra-thin and high-pixel mobile phone lens is demanded with the development of mobile phone market. Combining the non-spherical principles, an ultra-thin eight-mega-pixel lens system was designed by using optical software CODEV. Four plastic aspheric lenses, an IR cut filter and a sensor cover glass compose the system. From the object side to the image side, the first and the third lenses are positive lenses, the second and the fourth lenses are neg- ative lenses, and aperture stop is located in front of the first lens. The F-number is 2.4, FOV angle is 65.5, the effective focal length and the back focal length are 3. 731 5 mm and 0.31 ram, and the length of the total lens group of the optical system is 4.6mm. The MTF values of the most of EOV are more than 0.5 at 1/2 Nyquist sampling frequency, and distortion is less than 2 %.