手機相機模組之光學設計

Optical Design for Camera Module in Mobile Phones

許哲源(Che Yuan Hsu)

指導教授 ： 張明文 ； 柯正浩

元智大學/工程學院/電機工程學系/碩士(2004年)

摘要

本論文為一個三片式一百三十萬像素之手機相機鏡頭的設計實例。此系統的光學全長不僅須小於7mm，而且還需要有足夠長的後焦以便在成像面前放置紅外濾波片及影像感測器之覆蓋玻璃。
首先，依據CMOS影像感測器規格，制訂出一具合適的鏡頭光學規格，然後選取一已獲專利的鏡頭作為本設計的起始結構，並藉助光學設計軟體Zemax之透鏡比例縮放與快速聚焦功能來得到本設計的近軸面系統高斯解。接著由形狀因子對賽德像差做圖，可從中得到各片薄透鏡的曲率，再經過加厚程序，始得一合適的球面結構系統。最後，為了提昇系統效能，我們利用優化的技巧，將透鏡每一面非球面化，其目的是使MTF在最大空間頻率處能達到30％以上，讓設計成果更具實用性。

關鍵字

手機相機 ； 相機模組 ； 光學像差 ； 光學設計 ； 非球面

並列摘要

This thesis aims at a concrete design instance of a three-component camera lens with 1.3 mega pixels in mobile phones. The total length of this optical system must be within 7mm. Meanwhile, the back focal length must be long enough so that the IR cut-off filter and the cover glass of image sensor can be inserted before the imaging surface.
First of all, suitable lens optical specifications are made according to that of CMOS image sensor. The initial structure of this design is based on a patent lens. By means of “scale lens” and “quick focus” functions of the optical design software ZEMAX, the Gaussian solution of the paraxial surface system is obtained. Drawing a diagram in which Seidel aberration and shape factors serve as axes, curvatures of every slice of thin lens can be acquired. After thickening the lens, a suitable spherical structure is achieved. At last, in order to improve system performance, optimizing skills are utilized, that is, to make the surfaces of every lens become aspherical. As a result, MTF achieves over thirty percents in the maximum spatial frequency. With these techniques, the consequence of this design becomes more practical.

並列關鍵字

camera phone ； camera module ； optical aberration ； optical design ； aspherical surface

參考文獻

[2] Altman, M. Richard and D. L. John, “Optical Design Techniques for Polymer Optics,” SPIE Proceedings, Vol. 237, pp.380, 1980.

[8] H. H. Hopkins, Wave Theory of Aberration, Oxford, London, 1950.

[9] W. T. Welford, Aberrations of Optical Systems, 1st edition, Adam Hilger, London, 1986.

[1] 黃文孝，“射出成型對球面及非球面鏡片之影響研究，”雲林科技大學機械工程研究所，碩士論文，民國90年。

[3] L. H. Roger, The Handbook of Plastic Optics, 2nd ed., U.S. Precision Lens Inc, New York, 1983.