Junewen CHEN^*, Yao-Chen TSENG, Kai-Chun CHUANG, Jung-Chao CHEN, and Shu-Yuan LIN

Institute of Mechanical and Aerospace Engineering, Chung-Hua University, Hsinchu, Taiwan 30067

(Received July 11, 2008; Accepted November 26, 2008)

We have designed a practical mass produced rotating type miniature camera phone multi-focal-length optical system. The compact and short system, with 3× magnification, 1.3 megapixel sensor elements and total length of less than 10.7 mm, is described and evaluated in detail. Using Zemax lens design software, we start the design with thin lenses first order layout, and then spherical thick lenses, to aspherical lenses. Plastic lens materials are used whenever applicable, and diffractive lens elements are also employed to optimize the design. The beam spot diagrams and modulation transfer function of our design are found appropriate for good optical qualities.

Key words: camera phone, lens design, multi-focal-length optical system, miniature size, rotating type system

^*E-mail address: jwchen@chu.edu.tw