一种数码相机定焦镜头的光学系统设计

为适应市场上对结构简洁、成像品质高且生产成本低的数码相机镜头的需要，运用光学设计软件CODE V，在传统数码相机定焦镜头的基础上，结合非球面塑料透镜理论，模拟出了生产成本较低的三片式数码相机定焦镜头。该数码相机镜头结构的特点是：模块仅包括3块透镜；选择塑料镜头代替玻璃/塑料混合镜头或者全玻璃镜头，降低了系统的生产成本；系统的后焦距增大到0.8116mm，能够确保良好的远心光路性能；透镜表面完全采用非球面设计，较好地校正了球差等各种像差，使透镜具有良好的光学成像性能。

Optical system design for fixed-focus lens of digital camera

Based on the conventional fixed-focus lens and the aspherical principles, a triplet fixed-focus lens assembly for the digital camera was simulated with the optical system design software CODE V to meet the needs for the compactness, high transmissivity, excellent optical performance and low cost . In the lens assembly, plastic lenses were chosen instead of glass/plastic hybrid or all glass lenses for the cost and production consideration. The back focal length of the digital camera was increased by 0.8116 mm with the lens assembly. Therefore, it can guarantee a better performance for the telecentric beam path. The profiles of the three lenses were designed as aspheric surfaces so as to correct the aberration and ensure the excellent optical performance.